Nzqa expiring unit standard 948 version 5

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NZQA Expiring unit standard

948 version 5

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Machine brake discs and drums






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.


Motor Industry > Vehicle Braking Systems

Available grade


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 efficient functioning, reducing wear of linings.
1.2 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.
Outcome 2
Machine a brake drum and a brake disc rotor.
Evidence requirements
2.1 Safe working practices are observed throughout the task.
Range personal safety, safety of others, equipment and machining safety.
2.2 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.

Status information and last date for assessment for superseded versions




Last Date for Assessment



29 October 1993

31 December 2016



4 October 1996

31 December 2016



26 February 1999

31 December 2016



25 January 2008

31 December 2016



19 November 2010

31 December 2016

Accreditation and Moderation Action Plan (AMAP) reference


This AMAP can be accessed at
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

Ó New Zealand Qualifications Authority 2016

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