ABS Basics - A Review
Remanufactured Truck/Tractor ABS
Reman Meritor Wabco Style
What makes tractor and trailer ABS systems different?
Many modern tractor ABS systems use 4S/4M systems, and others can be 6S, depending upon the number of sensors used and the
number of axles present on the tractor unit. Trailers, on the other hand, typically employ a 2S/1M system with sensors present on
only one axle.
How does a trailer ABS system function with two tanks?
Historically, two tanks have been used on trailers to protect pressures and ensure that the braking system would have charged air.
However, due to the modern 8x air volume requirement, a single jumbo tank could be used. The use of two tanks is still typically
used in applications where there are tight spaces, or a number of auxiliary devices are used.
On which tank should I install my ABS valve?
As a general rule, valves should be installed centrally on a trailer. In other words, the tank that is closer to the center of the trailer in
terms of length of plumbing lines, should receive the valve. The reason for this is simply to ensure proper brake timing and balance.
On which axles should I install my ABS sensors?
ABS sensor location ultimately depends upon whether the trailer is equipped
with spring or air suspension. Typically, with spring suspension, sensors
should be installed in the axle furthest forward on the trailer, while with
air suspension, sensors should be installed to the rear axle in doubleaxle units and the middle axle of triple axle units. The general
principal is to attach the sensors to the axle, or wheel ends,
that are most likely to lockup during a hard
braking event.
Need more information?
For more details regarding Haldex ABS
Systems, refer to L30041 ABS Manual or
Contact the Haldex Technical Services
Department at 800-643-2374.
Screw-In
Connector
Type
NOTE:
• Valve Package Assemblies are
usually attached to a frame crossmember.
• All systems shown are 12 Volt.
• These ABS axle valve packs
listed are compatible with C, D
and E Versions of Meritor/Wabco
ECU’s.
• Use the following converter
cables to switch connector
styles: Screw to Bayonet
(8946011322K) / Bayonet to
Screw (8946011332K)
Product Description
System Configuration
Reman. Modulator Valve in Line Style
Reman. Modulator Valve in Line Style
Reman. Modulator Valve - Left
Reman. Modulator Valve - Right
Reman. Modulator Valve - Left
Reman. Modulator Valve - Right
Reman. Modulator Valve - Left
Reman. Modulator Valve - Right
Reman. Modulator Valve - Left
Reman. Modulator Valve - Right
Reman. Modulator Valve in Line Style
Reman. Modulator Valve in Line Style
Reman. Modulator Valve in Line Style
Reman. Modulator Valve in Line Style
One Delivery 180° from Supply
One Delivery 180° from Supply
4S/4M
4S/4M
4S/4M, 6S/4M or 6S/6M
4S/4M, 6S/4M or 6S/6M
4S/4M
4S/4M
4S/4M, 6S/4M or 6S/6M
4S/4M, 6S/4M or 6S/6M
One Delivery 90° to left of Supply & One 180°
One Delivery 90° to right of Supply & One 180°
One Delivery 90° to left of Supply & One 180°
One Delivery 90° to right of Supply & One 180°
Haldex Part #
4725003000X
1 psi Press. Diff.
Screw-In connector
4725003010X
3-4 psi Press. Diff.
Screw-In connector
4725003020X
6-8 psi Press. Diff.
Screw-In connector
4725003200X
1 psi Press. Diff.
Bayonet connector
4725003210X
3-4 psi Press. Diff.
Bayonet connector
4725003220X
6-8 psi Press. Diff.
Bayonet connector
Haldex Part #
Haldex Part #
Package Contents
4721950800X Modulator Valve - L
4721950810X Modulator Valve - R
9735001040X Quick Release Valve
4721950800X Modulator Valve - L
4721950810X Modulator Valve - R
9735001050X Quick Release Valve
4721950800X Modulator Valve - L
4721950810X Modulator Valve - R
9735001060X Quick Release Valve
4721950760X Modulator Valve - L
4721950770X Modulator Valve - R
9735001040X Quick Release Valve
4721950760X Modulator Valve - L
4721950770X Modulator Valve - R
9735001050X Quick Release Valve
4721950760X Modulator Valve - L
4721950770X Modulator Valve - R
9735001060X Quick Release Valve
Package Contents
9730110210X
Meritor WABCO Style ABS Relay Valve
9730110220X
Meritor WABCO Style ABS Relay Valve
9730110230X
Meritor WABCO Style ABS Relay Valve
9730110240X
Meritor WABCO Style ABS Relay Valve
9730110250X
Meritor WABCO Style ABS Relay Valve
9730110260X
Meritor WABCO Style ABS Relay Valve
9730110270X
Meritor WABCO Style ABS Relay Valve
9730110280X
Meritor WABCO Style ABS Relay Valve
9735001040X
Meritor WABCO Style ABS QR Valve
9735001050X
Meritor WABCO Style ABS QR Valve
9735001060X
Meritor WABCO Style ABS QR Valve
Haldex Commercial Vehicle Systems
Haldex Brake Products Corporation
Haldex Limited
10930 N. Pomona Ave.
525 Southgate Drive, Unit 1
Kansas City, MO 64153-1256
Guelph, Ontario CAN N1G 3W6
Phone: 816-891-2470
Phone: 519-826-7723
Fax: 816-891-9447
Fax: 519-826-9497
www.haldex.com
Complete Rear Axle Valve Packs
Bayonet
Connector
Type
Complete Front Axle Valve Packs
Why would one use a 4S/2M system on a trailer instead of the basic 2S/1M system?
The configuration of an ABS system typically depends upon the intended use of the trailer unit. While a 2S/1M system may meet the
minimum legal requirements, geographic road conditions can make a 4S/2M system more logical by offering added control of two
axles independently or side-by-side control of the trailer. Full type trailers require 4S/2M systems.
4721950050X
4721950520X
4721950760X
4721950770X
4721950780X
4721950790X
4721950800X
4721950810X
4721950820X
4721950830X
4721950920X
4721950930X
4721950940X
4721950950X
Valves
What do the “S” and “M” stand for when used to describe an ABS System such as 2S/1M?
The “S” is a convention used to denote the sensors in an ABS system, while the “M” refers to the modulator valves. Describing an
ABS system as 2S/1M simply means that it uses 2 sensors and 1 modulator valve. The basic 2S/1M system is used to monitor two
sensors attached to each wheel end of one axle, which is controlled by one modulator valve that receives instructions from an
electronic brain called an ECU.
Modulcator Valves
SKU #
Connector Type
Screw-in
Bayonet
Bayonet
Bayonet
Bayonet
Bayonet
Screw-in
Screw-in
Screw-in
Screw-in
Screw-in
Screw-in
Bayonet
Bayonet
ABS
Package Contents
4725001000X
3-4 psi Press. Diff.
Screw-In connector
4721950800X Modulator Valve - L
4721950810X Modulator Valve - R
9730110210X Service Brake Relay Valve
4725001010X
5.5 psi Press. Diff.
Screw-In connector
4721950800X Modulator Valve - L
4721950810X Modulator Valve - R
9730110220X Service Brake Relay Valve
4725001020X
4 psi Press Diff.
Screw-in connector
4721950820X Modulator Valve -L
4721950830X Modulator Valve - R
9730110210X Service Brake Relay Valve
4725001030X
5.5 psi Press Diff.
Screw-in connector
4721950820X Modulator Valve - L
4721950830X Modulator Valve - R
9730110220X Service Brake Relay Valve
4725001200X
3-4 psi Press. Diff.
Bayonet connector
4721950760X Modulator Valve - L
4721950770X Modulator Valve - R
9730110210X Service Brake Relay Valve
4725001210X
5.5 psi Press. Diff.
Bayonet connector
4721950760X Modulator Valve - L
4721950770X Modulator Valve - R
9730110220X Service Brake Relay Valve
4725001220X
4 psi Press Diff.
Bayonet connector
4721950780X Modulator Valve - L
4721950790X Modulator Valve - R
9730110210X Service Brake Relay Valve
4725001230X
5.5 psi Press Diff.
Bayonet connector
4721950780X Modulator Valve - L
4721950790X Modulator Valve - R
9730110220X Service Brake Relay Valve
4725001240X
4 psi Press Diff.
Bayonet connector
4721950780X Modulator Valve - L
4721950790X Modulator Valve - R
9730110230X Service Brake Relay Valve
4725001250X
5.5 psi Press Diff.
Bayonet connector
4721950780X Modulator Valve - L
4721950790X Modulator Valve - R
9730110240X Service Brake Relay Valve
4725002030X
5.5 psi Press Diff.
Screw-in connector
4721950820X Modulator Valve - L
4721950830X Modulator Valve - R
9730110260X Service Brake Relay Valve
4721707910X ATC Valve
4725002220X
4 psi Press Diff.
Bayonet connector
4721950780X Modulator Valve - L
4721950790X Modulator Valve - R
9730110250X Service Brake Relay Valve
4721707970X ATC Valve
4725002230X
5.5 psi Press Diff.
Bayonet connector
4721950780X Modulator Valve - L
4721950790X Modulator Valve - R
9730110260X Service Brake Relay Valve
4721707970X ATC Valve
4725002240X
4 psi Press Diff.
Bayonet connector
4721950780X Modulator Valve - L
4721950790X Modulator Valve - R
9730110270X Service Brake Relay Valve
4721707970X ATC Valve
4725002250X
5.5 psi Press Diff.
Bayonet connector
4721950780X Modulator Valve - L
4721950790X Modulator Valve - R
9730110280X Service Brake Relay Valve
4721707970X ATC Valve
L20555 US Rev 6/09 5M ??
L20555
Rev 6/09
Your ABS Superstore
Haldex All-Makes Trailer
ABS Replacement Kits
ABS
Haldex All-Makes ABS Components
Power Cord Extensions
Haldex Part #
AL919900
AL919901
AL919902
Symbol Key
All Makes. All Models
ABS Sensors
Haldex Part #
ABS Replacement Component Description
6.6 ft
13.1 ft
19.7 ft
(2.0 m)
(4.0 m)
(6.0 m)
Sensor with
90° Ends
Clips/Retainers
2S/1M Multi-Axle
2S/1M Multi-Axle
Haldex Part #
ABS Replacement Component Description
A59512309
A902700
A902701
A902702
AL920809
AL920810
Sensor
Sensor
Sensor
Sensor
Sensor
Sensor
retainer clip
/ lead retainer
to 3/4” O.D. hose (1/2” I.D.)
to 1/2” O.D. hose (3/8” I.D.)
to hose (Haldex O.D.)
to hose (Haldex O.D.)
Sensor with
Straight Ends
2S/1M Single-Axle
We’re the Stop for ABS
ABS Application
Multi-Axle
2S/1M Applications
12 Volt
1/2” Reservoir Port
ABS Application
Single or
Dolly Axle
2S/1M Applications
12 Volt
1/2” Reservoir Port
All Competitive
2S/1M Systems
Bosch
Haldex
Meritor/Wabco
Wabash
Haldex
Part Number
Key Kit Contents
AQ960503
6-port Valve/ECU Combo, 19.7 ft Power Cable
Extensions, Sensor Extensions
AQ960510
6-port Valve/ECU Combo, 19.7 ft Power Cable
Extensions, Sensor Extensions
Wabash MBS
AQ960514
4-port Valve/ECU Combo with back style mounting
bracket, 19.7 ft Power Cable Extensions, 8.2 ft Sensors
Upgrade Kit
AQ964110
12 Volt ECU/ECU Bracket, 3.3 ft Power Cable
Extensions, Sensor Extensions
All Competitive
2S/1M Systems
Bosch
Haldex
Meritor/Wabco
Wabash
Haldex
Part Number
AQ960505
Haldex Part #
ABS Replacement Component Description
AQ15463
A1017316
A920805
AQ15473
AQ15474
ABS lamp kit with 6” lead
ABS round indicator lamp (10 series)
Bracket for round ABS lamp
Power cord 5-way terminal kit
Loom assembly 5-way terminal kit
ABS Care Kit Part #: AQ961110
Haldex Part
#
AQ15474
AQ15473
AQ15463
AL10271914
AL10271915
AL1027196
AL919803
A902700
AL920809
L60050
L20243
ABS Replacement Component
Description
Loom Assembly Repair Kit
Power Cord End Kit
ABS Warning Light Kit
Sensor — 90° Body —18”
Sensor — 90° Body —72”
Sensor — Straight Body — 18”
Sensor Extension — 72”
Retainer — Sensor Cable to Lead
Sensor Clip
All-Makes ABS Repair Parts Wall Chart
Trailer ABS Service Components Catalog
AL10271914
AL364061
AL10271915
AL364062
AL364063
AL364053
AL1027196
AL1027197
1.6 ft
4.9 ft
6.6 ft
8.2 ft
11.5 ft
13.1 ft
1.6 ft
6.6 ft
(0.5
(1.5
(2.0
(2.5
(3.5
(4.0
(0.5
(2.0
m)
m)
m)
m)
m)
m)
m)
m)
Notes: Do NOT interchange with Bendix®. Haldex sensors have a resistance range
of 980 - 2350 Ω (OHMS).
Sensor Cable Extensions
Haldex Part #
Lamps/Cord End Kits
2S/1M Tandem Dolly
Component Description
Sensor Cable
Extensions
Component Description
AL919800
AL919801
AL919802
AL919803
AL919804
AL919805
AL919806
AL919807
AL919808
AL919809
AL919810
AL919811
1.6 ft
3.3 ft
4.9 ft
6.6 ft
8.2 ft
9.8 ft
11.5 ft
13.1 ft
16.4 ft
19.7 ft
26.2 ft
32.8 ft
(0.5 m)
(1.0 m)
(1.5 m)
(2.0 m)
(2.5 m)
(3.0 m)
(3.5 m)
(4.0 m)
(5.0 m)
(6.0 m)
(8.0 m)
(10.0 m)
Notes: Do NOT interchange with Bendix®.
Qty.
1
1
1
2
1
2
2
4
10
1
1
Power Cords
Haldex Part #
AL918600*
AL918601*
AL918602
AL918603
AL918604
AL918605
AL918606
*
Power Cord Length
65.6 ft (20.0 m)
39.4 ft (12.0 m)
65.6 ft (20.0 m)
39.4 ft (12.0 m)
52.5 ft (16.0 m)
59.1 ft (18.0 m)
16.0 ft (5.0 m)
ABS Lamp Lead Length
39.4
26.2
39.4
26.2
26.2
39.4
10.0
ft
ft
ft
ft
ft
ft
ft
(12.0 m)
(8.0 m)
(12.0 m)
(8.0 m)
(8.0 m)
(12.0 m)
(3.0 m)
Pre-2001 systems
Key Kit Contents
2-port Valve/ECU Combo, 19.7 ft Power Cable
Extensions, Sensor Extensions
Be sure to check out our selection of Remanufactured
Truck and Tractor ABS on the back of this brochure
Haldex All-Makes Trailer
ABS Replacement Kits
ABS
Haldex All-Makes ABS Components
Power Cord Extensions
Haldex Part #
AL919900
AL919901
AL919902
Symbol Key
All Makes. All Models
ABS Sensors
Haldex Part #
ABS Replacement Component Description
6.6 ft
13.1 ft
19.7 ft
(2.0 m)
(4.0 m)
(6.0 m)
Sensor with
90° Ends
Clips/Retainers
2S/1M Multi-Axle
2S/1M Multi-Axle
Haldex Part #
ABS Replacement Component Description
A59512309
A902700
A902701
A902702
AL920809
AL920810
Sensor
Sensor
Sensor
Sensor
Sensor
Sensor
retainer clip
/ lead retainer
to 3/4” O.D. hose (1/2” I.D.)
to 1/2” O.D. hose (3/8” I.D.)
to hose (Haldex O.D.)
to hose (Haldex O.D.)
Sensor with
Straight Ends
2S/1M Single-Axle
We’re the Stop for ABS
ABS Application
Multi-Axle
2S/1M Applications
12 Volt
1/2” Reservoir Port
ABS Application
Single or
Dolly Axle
2S/1M Applications
12 Volt
1/2” Reservoir Port
All Competitive
2S/1M Systems
Bosch
Haldex
Meritor/Wabco
Wabash
Haldex
Part Number
Key Kit Contents
AQ960503
6-port Valve/ECU Combo, 19.7 ft Power Cable
Extensions, Sensor Extensions
AQ960510
6-port Valve/ECU Combo, 19.7 ft Power Cable
Extensions, Sensor Extensions
Wabash MBS
AQ960514
4-port Valve/ECU Combo with back style mounting
bracket, 19.7 ft Power Cable Extensions, 8.2 ft Sensors
Upgrade Kit
AQ964110
12 Volt ECU/ECU Bracket, 3.3 ft Power Cable
Extensions, Sensor Extensions
All Competitive
2S/1M Systems
Bosch
Haldex
Meritor/Wabco
Wabash
Haldex
Part Number
AQ960505
Haldex Part #
ABS Replacement Component Description
AQ15463
A1017316
A920805
AQ15473
AQ15474
ABS lamp kit with 6” lead
ABS round indicator lamp (10 series)
Bracket for round ABS lamp
Power cord 5-way terminal kit
Loom assembly 5-way terminal kit
ABS Care Kit Part #: AQ961110
Haldex Part
#
AQ15474
AQ15473
AQ15463
AL10271914
AL10271915
AL1027196
AL919803
A902700
AL920809
L60050
L20243
ABS Replacement Component
Description
Loom Assembly Repair Kit
Power Cord End Kit
ABS Warning Light Kit
Sensor — 90° Body —18”
Sensor — 90° Body —72”
Sensor — Straight Body — 18”
Sensor Extension — 72”
Retainer — Sensor Cable to Lead
Sensor Clip
All-Makes ABS Repair Parts Wall Chart
Trailer ABS Service Components Catalog
AL10271914
AL364061
AL10271915
AL364062
AL364063
AL364053
AL1027196
AL1027197
1.6 ft
4.9 ft
6.6 ft
8.2 ft
11.5 ft
13.1 ft
1.6 ft
6.6 ft
(0.5
(1.5
(2.0
(2.5
(3.5
(4.0
(0.5
(2.0
m)
m)
m)
m)
m)
m)
m)
m)
Notes: Do NOT interchange with Bendix®. Haldex sensors have a resistance range
of 980 - 2350 Ω (OHMS).
Sensor Cable Extensions
Haldex Part #
Lamps/Cord End Kits
2S/1M Tandem Dolly
Component Description
Sensor Cable
Extensions
Component Description
AL919800
AL919801
AL919802
AL919803
AL919804
AL919805
AL919806
AL919807
AL919808
AL919809
AL919810
AL919811
1.6 ft
3.3 ft
4.9 ft
6.6 ft
8.2 ft
9.8 ft
11.5 ft
13.1 ft
16.4 ft
19.7 ft
26.2 ft
32.8 ft
(0.5 m)
(1.0 m)
(1.5 m)
(2.0 m)
(2.5 m)
(3.0 m)
(3.5 m)
(4.0 m)
(5.0 m)
(6.0 m)
(8.0 m)
(10.0 m)
Notes: Do NOT interchange with Bendix®.
Qty.
1
1
1
2
1
2
2
4
10
1
1
Power Cords
Haldex Part #
AL918600*
AL918601*
AL918602
AL918603
AL918604
AL918605
AL918606
*
Power Cord Length
65.6 ft (20.0 m)
39.4 ft (12.0 m)
65.6 ft (20.0 m)
39.4 ft (12.0 m)
52.5 ft (16.0 m)
59.1 ft (18.0 m)
16.0 ft (5.0 m)
ABS Lamp Lead Length
39.4
26.2
39.4
26.2
26.2
39.4
10.0
ft
ft
ft
ft
ft
ft
ft
(12.0 m)
(8.0 m)
(12.0 m)
(8.0 m)
(8.0 m)
(12.0 m)
(3.0 m)
Pre-2001 systems
Key Kit Contents
2-port Valve/ECU Combo, 19.7 ft Power Cable
Extensions, Sensor Extensions
Be sure to check out our selection of Remanufactured
Truck and Tractor ABS on the back of this brochure
Haldex All-Makes Trailer
ABS Replacement Kits
ABS
Haldex All-Makes ABS Components
Power Cord Extensions
Haldex Part #
AL919900
AL919901
AL919902
Symbol Key
All Makes. All Models
ABS Sensors
Haldex Part #
ABS Replacement Component Description
6.6 ft
13.1 ft
19.7 ft
(2.0 m)
(4.0 m)
(6.0 m)
Sensor with
90° Ends
Clips/Retainers
2S/1M Multi-Axle
2S/1M Multi-Axle
Haldex Part #
ABS Replacement Component Description
A59512309
A902700
A902701
A902702
AL920809
AL920810
Sensor
Sensor
Sensor
Sensor
Sensor
Sensor
retainer clip
/ lead retainer
to 3/4” O.D. hose (1/2” I.D.)
to 1/2” O.D. hose (3/8” I.D.)
to hose (Haldex O.D.)
to hose (Haldex O.D.)
Sensor with
Straight Ends
2S/1M Single-Axle
We’re the Stop for ABS
ABS Application
Multi-Axle
2S/1M Applications
12 Volt
1/2” Reservoir Port
ABS Application
Single or
Dolly Axle
2S/1M Applications
12 Volt
1/2” Reservoir Port
All Competitive
2S/1M Systems
Bosch
Haldex
Meritor/Wabco
Wabash
Haldex
Part Number
Key Kit Contents
AQ960503
6-port Valve/ECU Combo, 19.7 ft Power Cable
Extensions, Sensor Extensions
AQ960510
6-port Valve/ECU Combo, 19.7 ft Power Cable
Extensions, Sensor Extensions
Wabash MBS
AQ960514
4-port Valve/ECU Combo with back style mounting
bracket, 19.7 ft Power Cable Extensions, 8.2 ft Sensors
Upgrade Kit
AQ964110
12 Volt ECU/ECU Bracket, 3.3 ft Power Cable
Extensions, Sensor Extensions
All Competitive
2S/1M Systems
Bosch
Haldex
Meritor/Wabco
Wabash
Haldex
Part Number
AQ960505
Haldex Part #
ABS Replacement Component Description
AQ15463
A1017316
A920805
AQ15473
AQ15474
ABS lamp kit with 6” lead
ABS round indicator lamp (10 series)
Bracket for round ABS lamp
Power cord 5-way terminal kit
Loom assembly 5-way terminal kit
ABS Care Kit Part #: AQ961110
Haldex Part
#
AQ15474
AQ15473
AQ15463
AL10271914
AL10271915
AL1027196
AL919803
A902700
AL920809
L60050
L20243
ABS Replacement Component
Description
Loom Assembly Repair Kit
Power Cord End Kit
ABS Warning Light Kit
Sensor — 90° Body —18”
Sensor — 90° Body —72”
Sensor — Straight Body — 18”
Sensor Extension — 72”
Retainer — Sensor Cable to Lead
Sensor Clip
All-Makes ABS Repair Parts Wall Chart
Trailer ABS Service Components Catalog
AL10271914
AL364061
AL10271915
AL364062
AL364063
AL364053
AL1027196
AL1027197
1.6 ft
4.9 ft
6.6 ft
8.2 ft
11.5 ft
13.1 ft
1.6 ft
6.6 ft
(0.5
(1.5
(2.0
(2.5
(3.5
(4.0
(0.5
(2.0
m)
m)
m)
m)
m)
m)
m)
m)
Notes: Do NOT interchange with Bendix®. Haldex sensors have a resistance range
of 980 - 2350 Ω (OHMS).
Sensor Cable Extensions
Haldex Part #
Lamps/Cord End Kits
2S/1M Tandem Dolly
Component Description
Sensor Cable
Extensions
Component Description
AL919800
AL919801
AL919802
AL919803
AL919804
AL919805
AL919806
AL919807
AL919808
AL919809
AL919810
AL919811
1.6 ft
3.3 ft
4.9 ft
6.6 ft
8.2 ft
9.8 ft
11.5 ft
13.1 ft
16.4 ft
19.7 ft
26.2 ft
32.8 ft
(0.5 m)
(1.0 m)
(1.5 m)
(2.0 m)
(2.5 m)
(3.0 m)
(3.5 m)
(4.0 m)
(5.0 m)
(6.0 m)
(8.0 m)
(10.0 m)
Notes: Do NOT interchange with Bendix®.
Qty.
1
1
1
2
1
2
2
4
10
1
1
Power Cords
Haldex Part #
AL918600*
AL918601*
AL918602
AL918603
AL918604
AL918605
AL918606
*
Power Cord Length
65.6 ft (20.0 m)
39.4 ft (12.0 m)
65.6 ft (20.0 m)
39.4 ft (12.0 m)
52.5 ft (16.0 m)
59.1 ft (18.0 m)
16.0 ft (5.0 m)
ABS Lamp Lead Length
39.4
26.2
39.4
26.2
26.2
39.4
10.0
ft
ft
ft
ft
ft
ft
ft
(12.0 m)
(8.0 m)
(12.0 m)
(8.0 m)
(8.0 m)
(12.0 m)
(3.0 m)
Pre-2001 systems
Key Kit Contents
2-port Valve/ECU Combo, 19.7 ft Power Cable
Extensions, Sensor Extensions
Be sure to check out our selection of Remanufactured
Truck and Tractor ABS on the back of this brochure
ABS Basics - A Review
Remanufactured Truck/Tractor ABS
Reman Meritor Wabco Style
What makes tractor and trailer ABS systems different?
Many modern tractor ABS systems use 4S/4M systems, and others can be 6S, depending upon the number of sensors used and the
number of axles present on the tractor unit. Trailers, on the other hand, typically employ a 2S/1M system with sensors present on
only one axle.
How does a trailer ABS system function with two tanks?
Historically, two tanks have been used on trailers to protect pressures and ensure that the braking system would have charged air.
However, due to the modern 8x air volume requirement, a single jumbo tank could be used. The use of two tanks is still typically
used in applications where there are tight spaces, or a number of auxiliary devices are used.
On which tank should I install my ABS valve?
As a general rule, valves should be installed centrally on a trailer. In other words, the tank that is closer to the center of the trailer in
terms of length of plumbing lines, should receive the valve. The reason for this is simply to ensure proper brake timing and balance.
On which axles should I install my ABS sensors?
ABS sensor location ultimately depends upon whether the trailer is equipped
with spring or air suspension. Typically, with spring suspension, sensors
should be installed in the axle furthest forward on the trailer, while with
air suspension, sensors should be installed to the rear axle in doubleaxle units and the middle axle of triple axle units. The general
principal is to attach the sensors to the axle, or wheel ends,
that are most likely to lockup during a hard
braking event.
Need more information?
For more details regarding Haldex ABS
Systems, refer to L30041 ABS Manual or
Contact the Haldex Technical Services
Department at 800-643-2374.
Screw-In
Connector
Type
NOTE:
• Valve Package Assemblies are
usually attached to a frame crossmember.
• All systems shown are 12 Volt.
• These ABS axle valve packs
listed are compatible with C, D
and E Versions of Meritor/Wabco
ECU’s.
• Use the following converter
cables to switch connector
styles: Screw to Bayonet
(8946011322K) / Bayonet to
Screw (8946011332K)
Product Description
System Configuration
Reman. Modulator Valve in Line Style
Reman. Modulator Valve in Line Style
Reman. Modulator Valve - Left
Reman. Modulator Valve - Right
Reman. Modulator Valve - Left
Reman. Modulator Valve - Right
Reman. Modulator Valve - Left
Reman. Modulator Valve - Right
Reman. Modulator Valve - Left
Reman. Modulator Valve - Right
Reman. Modulator Valve in Line Style
Reman. Modulator Valve in Line Style
Reman. Modulator Valve in Line Style
Reman. Modulator Valve in Line Style
One Delivery 180° from Supply
One Delivery 180° from Supply
4S/4M
4S/4M
4S/4M, 6S/4M or 6S/6M
4S/4M, 6S/4M or 6S/6M
4S/4M
4S/4M
4S/4M, 6S/4M or 6S/6M
4S/4M, 6S/4M or 6S/6M
One Delivery 90° to left of Supply & One 180°
One Delivery 90° to right of Supply & One 180°
One Delivery 90° to left of Supply & One 180°
One Delivery 90° to right of Supply & One 180°
Haldex Part #
4725003000X
1 psi Press. Diff.
Screw-In connector
4725003010X
3-4 psi Press. Diff.
Screw-In connector
4725003020X
6-8 psi Press. Diff.
Screw-In connector
4725003200X
1 psi Press. Diff.
Bayonet connector
4725003210X
3-4 psi Press. Diff.
Bayonet connector
4725003220X
6-8 psi Press. Diff.
Bayonet connector
Haldex Part #
Haldex Part #
Package Contents
4721950800X Modulator Valve - L
4721950810X Modulator Valve - R
9735001040X Quick Release Valve
4721950800X Modulator Valve - L
4721950810X Modulator Valve - R
9735001050X Quick Release Valve
4721950800X Modulator Valve - L
4721950810X Modulator Valve - R
9735001060X Quick Release Valve
4721950760X Modulator Valve - L
4721950770X Modulator Valve - R
9735001040X Quick Release Valve
4721950760X Modulator Valve - L
4721950770X Modulator Valve - R
9735001050X Quick Release Valve
4721950760X Modulator Valve - L
4721950770X Modulator Valve - R
9735001060X Quick Release Valve
Package Contents
9730110210X
Meritor WABCO Style ABS Relay Valve
9730110220X
Meritor WABCO Style ABS Relay Valve
9730110230X
Meritor WABCO Style ABS Relay Valve
9730110240X
Meritor WABCO Style ABS Relay Valve
9730110250X
Meritor WABCO Style ABS Relay Valve
9730110260X
Meritor WABCO Style ABS Relay Valve
9730110270X
Meritor WABCO Style ABS Relay Valve
9730110280X
Meritor WABCO Style ABS Relay Valve
9735001040X
Meritor WABCO Style ABS QR Valve
9735001050X
Meritor WABCO Style ABS QR Valve
9735001060X
Meritor WABCO Style ABS QR Valve
Haldex Commercial Vehicle Systems
Haldex Brake Products Corporation
Haldex Limited
10930 N. Pomona Ave.
525 Southgate Drive, Unit 1
Kansas City, MO 64153-1256
Guelph, Ontario CAN N1G 3W6
Phone: 816-891-2470
Phone: 519-826-7723
Fax: 816-891-9447
Fax: 519-826-9497
www.haldex.com
Complete Rear Axle Valve Packs
Bayonet
Connector
Type
Complete Front Axle Valve Packs
Why would one use a 4S/2M system on a trailer instead of the basic 2S/1M system?
The configuration of an ABS system typically depends upon the intended use of the trailer unit. While a 2S/1M system may meet the
minimum legal requirements, geographic road conditions can make a 4S/2M system more logical by offering added control of two
axles independently or side-by-side control of the trailer. Full type trailers require 4S/2M systems.
4721950050X
4721950520X
4721950760X
4721950770X
4721950780X
4721950790X
4721950800X
4721950810X
4721950820X
4721950830X
4721950920X
4721950930X
4721950940X
4721950950X
Valves
What do the “S” and “M” stand for when used to describe an ABS System such as 2S/1M?
The “S” is a convention used to denote the sensors in an ABS system, while the “M” refers to the modulator valves. Describing an
ABS system as 2S/1M simply means that it uses 2 sensors and 1 modulator valve. The basic 2S/1M system is used to monitor two
sensors attached to each wheel end of one axle, which is controlled by one modulator valve that receives instructions from an
electronic brain called an ECU.
Modulcator Valves
SKU #
Connector Type
Screw-in
Bayonet
Bayonet
Bayonet
Bayonet
Bayonet
Screw-in
Screw-in
Screw-in
Screw-in
Screw-in
Screw-in
Bayonet
Bayonet
ABS
Package Contents
4725001000X
3-4 psi Press. Diff.
Screw-In connector
4721950800X Modulator Valve - L
4721950810X Modulator Valve - R
9730110210X Service Brake Relay Valve
4725001010X
5.5 psi Press. Diff.
Screw-In connector
4721950800X Modulator Valve - L
4721950810X Modulator Valve - R
9730110220X Service Brake Relay Valve
4725001020X
4 psi Press Diff.
Screw-in connector
4721950820X Modulator Valve -L
4721950830X Modulator Valve - R
9730110210X Service Brake Relay Valve
4725001030X
5.5 psi Press Diff.
Screw-in connector
4721950820X Modulator Valve - L
4721950830X Modulator Valve - R
9730110220X Service Brake Relay Valve
4725001200X
3-4 psi Press. Diff.
Bayonet connector
4721950760X Modulator Valve - L
4721950770X Modulator Valve - R
9730110210X Service Brake Relay Valve
4725001210X
5.5 psi Press. Diff.
Bayonet connector
4721950760X Modulator Valve - L
4721950770X Modulator Valve - R
9730110220X Service Brake Relay Valve
4725001220X
4 psi Press Diff.
Bayonet connector
4721950780X Modulator Valve - L
4721950790X Modulator Valve - R
9730110210X Service Brake Relay Valve
4725001230X
5.5 psi Press Diff.
Bayonet connector
4721950780X Modulator Valve - L
4721950790X Modulator Valve - R
9730110220X Service Brake Relay Valve
4725001240X
4 psi Press Diff.
Bayonet connector
4721950780X Modulator Valve - L
4721950790X Modulator Valve - R
9730110230X Service Brake Relay Valve
4725001250X
5.5 psi Press Diff.
Bayonet connector
4721950780X Modulator Valve - L
4721950790X Modulator Valve - R
9730110240X Service Brake Relay Valve
4725002030X
5.5 psi Press Diff.
Screw-in connector
4721950820X Modulator Valve - L
4721950830X Modulator Valve - R
9730110260X Service Brake Relay Valve
4721707910X ATC Valve
4725002220X
4 psi Press Diff.
Bayonet connector
4721950780X Modulator Valve - L
4721950790X Modulator Valve - R
9730110250X Service Brake Relay Valve
4721707970X ATC Valve
4725002230X
5.5 psi Press Diff.
Bayonet connector
4721950780X Modulator Valve - L
4721950790X Modulator Valve - R
9730110260X Service Brake Relay Valve
4721707970X ATC Valve
4725002240X
4 psi Press Diff.
Bayonet connector
4721950780X Modulator Valve - L
4721950790X Modulator Valve - R
9730110270X Service Brake Relay Valve
4721707970X ATC Valve
4725002250X
5.5 psi Press Diff.
Bayonet connector
4721950780X Modulator Valve - L
4721950790X Modulator Valve - R
9730110280X Service Brake Relay Valve
4721707970X ATC Valve
L20555 US Rev 6/09 5M ??
L20555
Rev 6/09
Your ABS Superstore
ABS Basics - A Review
Remanufactured Truck/Tractor ABS
Reman Meritor Wabco Style
What makes tractor and trailer ABS systems different?
Many modern tractor ABS systems use 4S/4M systems, and others can be 6S, depending upon the number of sensors used and the
number of axles present on the tractor unit. Trailers, on the other hand, typically employ a 2S/1M system with sensors present on
only one axle.
How does a trailer ABS system function with two tanks?
Historically, two tanks have been used on trailers to protect pressures and ensure that the braking system would have charged air.
However, due to the modern 8x air volume requirement, a single jumbo tank could be used. The use of two tanks is still typically
used in applications where there are tight spaces, or a number of auxiliary devices are used.
On which tank should I install my ABS valve?
As a general rule, valves should be installed centrally on a trailer. In other words, the tank that is closer to the center of the trailer in
terms of length of plumbing lines, should receive the valve. The reason for this is simply to ensure proper brake timing and balance.
On which axles should I install my ABS sensors?
ABS sensor location ultimately depends upon whether the trailer is equipped
with spring or air suspension. Typically, with spring suspension, sensors
should be installed in the axle furthest forward on the trailer, while with
air suspension, sensors should be installed to the rear axle in doubleaxle units and the middle axle of triple axle units. The general
principal is to attach the sensors to the axle, or wheel ends,
that are most likely to lockup during a hard
braking event.
Need more information?
For more details regarding Haldex ABS
Systems, refer to L30041 ABS Manual or
Contact the Haldex Technical Services
Department at 800-643-2374.
Screw-In
Connector
Type
NOTE:
• Valve Package Assemblies are
usually attached to a frame crossmember.
• All systems shown are 12 Volt.
• These ABS axle valve packs
listed are compatible with C, D
and E Versions of Meritor/Wabco
ECU’s.
• Use the following converter
cables to switch connector
styles: Screw to Bayonet
(8946011322K) / Bayonet to
Screw (8946011332K)
Product Description
System Configuration
Reman. Modulator Valve in Line Style
Reman. Modulator Valve in Line Style
Reman. Modulator Valve - Left
Reman. Modulator Valve - Right
Reman. Modulator Valve - Left
Reman. Modulator Valve - Right
Reman. Modulator Valve - Left
Reman. Modulator Valve - Right
Reman. Modulator Valve - Left
Reman. Modulator Valve - Right
Reman. Modulator Valve in Line Style
Reman. Modulator Valve in Line Style
Reman. Modulator Valve in Line Style
Reman. Modulator Valve in Line Style
One Delivery 180° from Supply
One Delivery 180° from Supply
4S/4M
4S/4M
4S/4M, 6S/4M or 6S/6M
4S/4M, 6S/4M or 6S/6M
4S/4M
4S/4M
4S/4M, 6S/4M or 6S/6M
4S/4M, 6S/4M or 6S/6M
One Delivery 90° to left of Supply & One 180°
One Delivery 90° to right of Supply & One 180°
One Delivery 90° to left of Supply & One 180°
One Delivery 90° to right of Supply & One 180°
Haldex Part #
4725003000X
1 psi Press. Diff.
Screw-In connector
4725003010X
3-4 psi Press. Diff.
Screw-In connector
4725003020X
6-8 psi Press. Diff.
Screw-In connector
4725003200X
1 psi Press. Diff.
Bayonet connector
4725003210X
3-4 psi Press. Diff.
Bayonet connector
4725003220X
6-8 psi Press. Diff.
Bayonet connector
Haldex Part #
Haldex Part #
Package Contents
4721950800X Modulator Valve - L
4721950810X Modulator Valve - R
9735001040X Quick Release Valve
4721950800X Modulator Valve - L
4721950810X Modulator Valve - R
9735001050X Quick Release Valve
4721950800X Modulator Valve - L
4721950810X Modulator Valve - R
9735001060X Quick Release Valve
4721950760X Modulator Valve - L
4721950770X Modulator Valve - R
9735001040X Quick Release Valve
4721950760X Modulator Valve - L
4721950770X Modulator Valve - R
9735001050X Quick Release Valve
4721950760X Modulator Valve - L
4721950770X Modulator Valve - R
9735001060X Quick Release Valve
Package Contents
9730110210X
Meritor WABCO Style ABS Relay Valve
9730110220X
Meritor WABCO Style ABS Relay Valve
9730110230X
Meritor WABCO Style ABS Relay Valve
9730110240X
Meritor WABCO Style ABS Relay Valve
9730110250X
Meritor WABCO Style ABS Relay Valve
9730110260X
Meritor WABCO Style ABS Relay Valve
9730110270X
Meritor WABCO Style ABS Relay Valve
9730110280X
Meritor WABCO Style ABS Relay Valve
9735001040X
Meritor WABCO Style ABS QR Valve
9735001050X
Meritor WABCO Style ABS QR Valve
9735001060X
Meritor WABCO Style ABS QR Valve
Haldex Commercial Vehicle Systems
Haldex Brake Products Corporation
Haldex Limited
10930 N. Pomona Ave.
525 Southgate Drive, Unit 1
Kansas City, MO 64153-1256
Guelph, Ontario CAN N1G 3W6
Phone: 816-891-2470
Phone: 519-826-7723
Fax: 816-891-9447
Fax: 519-826-9497
www.haldex.com
Complete Rear Axle Valve Packs
Bayonet
Connector
Type
Complete Front Axle Valve Packs
Why would one use a 4S/2M system on a trailer instead of the basic 2S/1M system?
The configuration of an ABS system typically depends upon the intended use of the trailer unit. While a 2S/1M system may meet the
minimum legal requirements, geographic road conditions can make a 4S/2M system more logical by offering added control of two
axles independently or side-by-side control of the trailer. Full type trailers require 4S/2M systems.
4721950050X
4721950520X
4721950760X
4721950770X
4721950780X
4721950790X
4721950800X
4721950810X
4721950820X
4721950830X
4721950920X
4721950930X
4721950940X
4721950950X
Valves
What do the “S” and “M” stand for when used to describe an ABS System such as 2S/1M?
The “S” is a convention used to denote the sensors in an ABS system, while the “M” refers to the modulator valves. Describing an
ABS system as 2S/1M simply means that it uses 2 sensors and 1 modulator valve. The basic 2S/1M system is used to monitor two
sensors attached to each wheel end of one axle, which is controlled by one modulator valve that receives instructions from an
electronic brain called an ECU.
Modulcator Valves
SKU #
Connector Type
Screw-in
Bayonet
Bayonet
Bayonet
Bayonet
Bayonet
Screw-in
Screw-in
Screw-in
Screw-in
Screw-in
Screw-in
Bayonet
Bayonet
ABS
Package Contents
4725001000X
3-4 psi Press. Diff.
Screw-In connector
4721950800X Modulator Valve - L
4721950810X Modulator Valve - R
9730110210X Service Brake Relay Valve
4725001010X
5.5 psi Press. Diff.
Screw-In connector
4721950800X Modulator Valve - L
4721950810X Modulator Valve - R
9730110220X Service Brake Relay Valve
4725001020X
4 psi Press Diff.
Screw-in connector
4721950820X Modulator Valve -L
4721950830X Modulator Valve - R
9730110210X Service Brake Relay Valve
4725001030X
5.5 psi Press Diff.
Screw-in connector
4721950820X Modulator Valve - L
4721950830X Modulator Valve - R
9730110220X Service Brake Relay Valve
4725001200X
3-4 psi Press. Diff.
Bayonet connector
4721950760X Modulator Valve - L
4721950770X Modulator Valve - R
9730110210X Service Brake Relay Valve
4725001210X
5.5 psi Press. Diff.
Bayonet connector
4721950760X Modulator Valve - L
4721950770X Modulator Valve - R
9730110220X Service Brake Relay Valve
4725001220X
4 psi Press Diff.
Bayonet connector
4721950780X Modulator Valve - L
4721950790X Modulator Valve - R
9730110210X Service Brake Relay Valve
4725001230X
5.5 psi Press Diff.
Bayonet connector
4721950780X Modulator Valve - L
4721950790X Modulator Valve - R
9730110220X Service Brake Relay Valve
4725001240X
4 psi Press Diff.
Bayonet connector
4721950780X Modulator Valve - L
4721950790X Modulator Valve - R
9730110230X Service Brake Relay Valve
4725001250X
5.5 psi Press Diff.
Bayonet connector
4721950780X Modulator Valve - L
4721950790X Modulator Valve - R
9730110240X Service Brake Relay Valve
4725002030X
5.5 psi Press Diff.
Screw-in connector
4721950820X Modulator Valve - L
4721950830X Modulator Valve - R
9730110260X Service Brake Relay Valve
4721707910X ATC Valve
4725002220X
4 psi Press Diff.
Bayonet connector
4721950780X Modulator Valve - L
4721950790X Modulator Valve - R
9730110250X Service Brake Relay Valve
4721707970X ATC Valve
4725002230X
5.5 psi Press Diff.
Bayonet connector
4721950780X Modulator Valve - L
4721950790X Modulator Valve - R
9730110260X Service Brake Relay Valve
4721707970X ATC Valve
4725002240X
4 psi Press Diff.
Bayonet connector
4721950780X Modulator Valve - L
4721950790X Modulator Valve - R
9730110270X Service Brake Relay Valve
4721707970X ATC Valve
4725002250X
5.5 psi Press Diff.
Bayonet connector
4721950780X Modulator Valve - L
4721950790X Modulator Valve - R
9730110280X Service Brake Relay Valve
4721707970X ATC Valve
L20555 US Rev 6/09 5M ALP
L20555
Rev 6/09
Your ABS Superstore