NZQA Expiring unit standard
948 version 5
Page 1 of 3
Title
Machine brake discs and drums
Level
3
Credits
2
Purpose
This unit standard is for people in the automotive repair
industry. People credited with this unit standard are able to
demonstrate knowledge of brake disc and drum machining
requirements, and machine a brake drum and a brake disc
rotor.
Classification
Motor Industry > Vehicle Braking Systems
Available grade
Achieved
Explanatory notes
The following legislation and amendments are required to be consulted and followed
where applicable:
–
Health and Safety in Employment Act, 1992.
Outcomes and evidence requirements
Outcome 1
Demonstrate knowledge of brake disc and drum machining requirements.
Evidence requirements
1.1
The purpose of machining disc rotors and drums is identified.
Range
1.2
efficient functioning, reducing wear of linings.
The reasons for maximum tolerances of disc rotor thickness and surface
condition are identified.
Range
calliper action, pedal pulsation, heat dissipation, manufacturer's
design capabilities, safety.
NZ Motor Industry Training Organisation
(Incorporated)
SSB Code 101542
 New Zealand Qualifications Authority 2016
NZQA Expiring unit standard
948 version 5
Page 2 of 3
Outcome 2
Machine a brake drum and a brake disc rotor.
Evidence requirements
2.1
Safe working practices are observed throughout the task.
Range
2.2
personal safety, safety of others, equipment and machining safety.
The drum and disc serviceability is verified according to manufacturer’s
specifications.
Range
precision measurement of surfaces, visual inspection.
2.3
The drum and disc lathe operating instructions are followed during the
machining operation.
2.4
The drum and disc surfaces are machined to within manufacturer's
specifications.
Range
lathe cutting bits checked for condition, lathe cutting depth, feed
and speed calculated, reference to manufacturer's minimum
thickness standard, mounting surfaces clean and free of burrs and
grease, mounting hub runout, use of noise dampening device,
equal cut on disc surfaces;
runout and parallelism within manufacturer's tolerances, disc
thickness within manufacturer's tolerance.
2.5
A non-directional finish is applied to the machined surfaces.
2.6
All drum and disc surfaces are washed to ensure that no fine particles left from
resurfacing are present.
2.7
Drums and discs are measured to ensure compliance with manufacturer’s
minimum disc and maximum drum tolerances.
2.8
The lathe and associated equipment are cleaned and stored ready for further
use.
2.9
The machined drum and disc are labelled detailing the amount of machining
carried out.
Replacement information
This unit standard has been replaced by unit standard
24410 and unit standard 24411.
This unit standard is expiring. Assessment against the standard must take place by
the last date for assessment set out below.
NZ Motor Industry Training Organisation
(Incorporated)
SSB Code 101542
 New Zealand Qualifications Authority 2016
NZQA Expiring unit standard
948 version 5
Page 3 of 3
Status information and last date for assessment for superseded versions
Process
Version Date
Last Date for Assessment
Registration
1
29 October 1993
31 December 2016
Review
2
4 October 1996
31 December 2016
Review
3
26 February 1999
31 December 2016
Review
4
25 January 2008
31 December 2016
Rollover
5
19 November 2010
31 December 2016
Accreditation and Moderation Action Plan (AMAP) reference
0014
This AMAP can be accessed at http://www.nzqa.govt.nz/framework/search/index.do.
Please note
Providers must be granted consent to assess against standards (accredited) by NZQA, or
an inter-institutional body with delegated authority for quality assurance, before they can
report credits from assessment against unit standards or deliver courses of study leading
to that assessment.
Industry Training Organisations must be granted consent to assess against standards by
NZQA before they can register credits from assessment against unit standards.
Providers and Industry Training Organisations, which have been granted consent and
which are assessing against unit standards must engage with the moderation system that
applies to those standards.
Consent requirements and an outline of the moderation system that applies to this
standard are outlined in the Accreditation and Moderation Action Plan (AMAP). The
AMAP also includes useful information about special requirements for organisations
wishing to develop education and training programmes, such as minimum qualifications for
tutors and assessors, and special resource requirements.
NZ Motor Industry Training Organisation
(Incorporated)
SSB Code 101542
 New Zealand Qualifications Authority 2016