NZQA Expiring unit standard
15478 version 4
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Title
Demonstrate knowledge of hydraulic brakes on heavy vehicles and
machines, and repair them
Level
4
Credits
4
Purpose
This unit standard is for people in the automotive repair
industry. People credited with this unit standard are able to:
demonstrate knowledge of hydraulic braking systems used on
heavy vehicles and equipment; test a hydraulic brake system;
and repair components of a hydraulic brake system.
Classification
Motor Industry > Vehicle Braking Systems
Available grade
Achieved
Explanatory notes
1
The following legislation, regulations, standards, and their amendments are required
to be consulted and followed where applicable:
– Health and Safety in Employment Act, 1992
– Traffic Regulations, 1976
– Heavy Vehicle Brake Code, 1991.
2
Reference to suitable tools and equipment means industry approved tools and
equipment that are recognised within the industry as being the most suited to
complete the task to a professional and competent manner with due regard to safe
working practices.
3
Because of the particular nature of this unit standard, it is essential that the practical
assessment evidence is obtained from commercial jobs in the workplace under
normal workplace conditions.
Outcomes and evidence requirements
Outcome 1
Demonstrate knowledge of hydraulic braking systems used on heavy vehicles and
equipment.
Evidence requirements
1.1
Hydraulic brake fluid service requirements are identified.
Range
classification, types, handling precautions, characteristics.
NZ Motor Industry Training Organisation
(Incorporated)
SSB Code 101542
 New Zealand Qualifications Authority 2016
NZQA Expiring unit standard
1.2
Hydraulic principles relating to braking systems are identified.
Range
1.3
forces, energy transfer, work, power.
Air over hydraulic brake systems are described according to vehicle and
equipment manufacturer’s specifications.
Range
1.4
15478 version 4
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system layout, system components, application, balance, release,
fail safe.
Vacuum assisted brake systems are described according to vehicle and
equipment manufacturer’s specifications.
Range
system layout, system components, application, balance, release,
fail safe.
Outcome 2
Test a hydraulic brake system.
Evidence requirements
2.1
Suitable tools and equipment are selected and used to enable the braking
system to be tested.
2.2
Safety precautions are taken when testing hydraulic brakes.
Range
2.3
personal safety, safety of others, equipment and vehicle safety.
An air over hydraulic brake system is tested and compared to manufacturer’s
specifications and compliance with Traffic Regulations.
Outcome 3
Repair components of a hydraulic brake system.
Evidence requirements
3.1
Suitable tools and equipment are selected and used to enable the braking
system components to be repaired.
3.2
Safety precautions are taken when repairing hydraulic brake components.
Range
3.3
personal safety, safety of others, equipment and vehicle safety.
Brake lines are repaired and/or replaced according to Traffic Regulation
requirements.
Range
hydraulic brake pipe, pneumatic brake pipe.
NZ Motor Industry Training Organisation
(Incorporated)
SSB Code 101542
 New Zealand Qualifications Authority 2016
NZQA Expiring unit standard
3.4
15478 version 4
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Air over hydraulic brake system components are repaired according to
manufacturer’s workshop manual instructions and to meet manufacturer’s
specifications and Traffic Regulation requirements.
Range
foot valve, master cylinder, wheel cylinder, brake calliper.
Replacement information
This unit standard has been replaced by unit standard
24420 and unit standard 24421. This unit standard, unit
standard 15475, unit standard 15479, and unit standard
15480 replaced unit standard 2323.
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
Process
Version Date
Last Date for Assessment
Registration
1
21 February 1999
31 December 2016
Review
2
25 January 2008
31 December 2016
Rollover
3
19 November 2010
31 December 2016
Rollover
4
18 February 2016
31 December 2020
Consent and Moderation Requirements (CMR) reference
0014
This CMR 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 Conesnt and Moderation Requirements (CMR). The CMR
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