Section 2 – Suspension ...............................................................................................................................22
1.
Suspension & Frame Attachments .................................................................................................................. 22
2.
Axle Attaching & Tracking Components ....................................................................................................... 23
3.
Axle & Axle Assembly ................................................................................................................................... 24
4.
Spring & Spring Attachment........................................................................................................................... 24
5.
Air Suspension ................................................................................................................................................ 25
6.
Shock Absorber/Strut Assembly ..................................................................................................................... 27
Section 3 – Brake Systems .........................................................................................................................28
A. OPTIONS FOR INSPECTING INTERNAL BRAKE COMPONENTS OF HYDRAULIC AND AIR
BRAKE SYSTEMS ................................................................................................................................................ 28
1.
Types of Brake Inspections ......................................................................................................................... 28
2.
Disassembly of Wheels and/or Drums for Inspection................................................................................. 28
3.
Exemptions from Brake Disassembly for Drum Brakes ............................................................................. 29
4.
Exemptions from Wheel Disassembly for Disc Brakes .............................................................................. 29
5.
Exemptions from Brake/Wheel Disassembly for New Vehicles ................................................................ 29
6.
Summary of Inspection Requirements for Trucks and Trailers on 12-Month Inspection Cycle................. 30
7.
Summary of Inspection Requirements for Trucks on 6-Month Inspection Cycle....................................... 30
8.
Summary of Inspection Requirements for Buses ........................................................................................ 31
B.
REQUIRED MEASUREMENT OF BRAKE COMPONENTS..................................................................... 32
1.
Drum Brake Systems .................................................................................................................................. 32
2.
Disc Brake Systems .................................................................................................................................... 32
C. DOCUMENTS REQUIRED FOR QUALIFYING A PRIOR INSPECTION OF INTERNAL BRAKE
COMPONENTS ..................................................................................................................................................... 32
D.
1.
Common Information.................................................................................................................................. 32
2.
Additional Information Required for Drum Brakes .................................................................................... 32
3.
Additional Information Required for Disc Brakes ...................................................................................... 33
PROHIBITION ON REMOVAL OF BRAKES FROM A VEHICLE ........................................................... 33
Section 3A – Air Brakes .............................................................................................................................53
1.
Air Supply System .......................................................................................................................................... 53
2.
Air System Leakage on a Trailer .................................................................................................................... 55
3.
Air Tank .......................................................................................................................................................... 55
4.
Air Tank Check Valves ................................................................................................................................... 56
5.
Brake Valves & Controls ................................................................................................................................ 58
6.
Parking Brake and Emergency Application on Truck or Bus ..................................................................... 60
7.
Parking Brake and Emergency Application on Trailer ............................................................................... 60
8.
Air System Components ............................................................................................................................. 61
9.
Brake Chamber ........................................................................................................................................... 62
10.
Drum Brake System Components ............................................................................................................... 62
11.
S-Cam Drum Brake System ........................................................................................................................ 65
12.
Anti-Lock Brake System (ABS) on Trailer................................................................................................. 71
Section 6 – Lamps.......................................................................................................................................88
1.
Required Lamps .............................................................................................................................................. 88
2.
Reflex Reflector .............................................................................................................................................. 92
3.
Retro-Reflective Marking ............................................................................................................................... 93
Section 7 – Electrical System ...................................................................................................................103
1.
Wiring ........................................................................................................................................................... 103
2.
Trailer Cord (output to towed vehicle).......................................................................................................... 104
Section 8 – Body .......................................................................................................................................106
1.
Cargo Body ............................................................................................................................................... 109
2.
Frame, Rails & Mounts ............................................................................................................................. 111
3.
Unitized Body Elements ........................................................................................................................... 113
4.
Cab or Cargo Door .................................................................................................................................... 113
5.
6.
Refrigeration/Heater Unit Fuel System (Reefer or Auxiliary Power Unity [APU]) ............................. 116
Fender/Mud Flap ................................................................................................................................... 123
7.
Landing Gear on Trailer ........................................................................................................................ 124
8.
Sliding Axle Assembly (Sliding Bogie) on Trailer ............................................................................... 124
9.
Aerodynamic Device and Attachment .................................................................................................. 125
10.
Rear Impact Guard (RIG) on Trailer..................................................................................................... 126
Section 9 – Tire and Wheel ......................................................................................................................135
1.
Tire Tread Depth ....................................................................................................................................... 135
2.
Tire Tread Condition................................................................................................................................. 135
3.
Tire Sidewall and Manufacturer Markings ............................................................................................... 136
4.
Tire Inflation Pressure............................................................................................................................... 137
5.
Wheel Hub ................................................................................................................................................ 138
6.
Wheel Bearing .......................................................................................................................................... 139
7.
Wheel/Rim (Applies to all wheel types) ................................................................................................... 140
8.
Disc Wheel System ............................................................................................................................... 142
9.
Wheel Fasteners (Nuts, Bolts and Studs) .............................................................................................. 142