AURLTB003
Diagnose and repair light vehicle hydraulic braking systems


Application

This unit describes the performance outcomes required to diagnose and repair faults in the hydraulic braking systems of light vehicles. It involves preparing for the task, selecting the correct diagnostic procedure, carrying out the diagnosis and the repair, performing post-repair testing, and completing workplace processes and documentation.

It applies to those working in the automotive service and repair industry. The hydraulic braking systems include those in light vehicles, light commercial vehicles or outdoor power equipment. This unit does not apply to agricultural machinery, heavy commercial vehicles, mobile plant machinery or motorcycles.

No licensing, legislative, regulatory or certification requirements apply to this unit at the time of publication.


Elements and Performance Criteria

Elements

Elements describe the essential outcomes.

Performance Criteria

Performance criteria describe the performance needed to demonstrate achievement of the element. Where bold and italicised text is used, further information is detailed in the range of conditions section.

1. Prepare to diagnose and repair light vehicle hydraulic braking system

1.1 Job requirements are determined from workplace instructions

1.2 Diagnostic information is sourced and interpreted

1.3 Diagnostic options are analysed and those most appropriate to the circumstances are selected

1.4 Hazards associated with the work are identified and risks are managed

1.5 Diagnostic tools and equipment are selected and checked for serviceability

2. Diagnose braking system

2.1 Diagnostic tests are performed according to workplace procedures and safety and environmental requirements

2.2 Faults are identified from diagnostic test results and causes of faults are determined

2.3 Diagnosis findings are reported according to workplace procedures, including recommendations for necessary repairs or adjustments

3. Repair braking system

3.1 Repair information is sourced and interpreted

3.2 Repair options are analysed and those most appropriate to the circumstances are selected

3.3 Repair tools, equipment and materials are selected and checked

3.4 Repairs and component replacements and adjustments are carried out according to manufacturer specifications, safety and environmental requirements, and without causing damage to components or system

3.5 Post-repair testing is carried out according to workplace procedures to confirm fault rectification, and any further problems detected as having been introduced during the repair process are rectified

4. Complete work processes

4.1 Final inspection is made to ensure work is to workplace expectations and vehicle is presented ready for use

4.2 Work area is cleaned, waste and non-recyclable materials are disposed of, and recyclable material is collected

4.3 Tools and equipment are checked and stored according to workplace procedures

4.4 Workplace documentation is processed according to workplace procedures

Evidence of Performance

Before competency can be determined, individuals must demonstrate they can perform the following according to the standards defined in this unit’s elements, performance criteria, range of conditions and foundation skills:

diagnose and repair a fault in:

two different light vehicle four-wheel disc hydraulic braking systems, in which the work must involve removing and refitting or replacing the brake calipers, disc pads and disc rotors

one light vehicle drum braking system, in which the work must involve removing and refitting or replacing brake drums, brake shoes and wheel cylinders

one light vehicle brake master cylinder, in which the work must involve removing and refitting or replacing the brake master cylinder.


Evidence of Knowledge

Individuals must be able to demonstrate knowledge of:

work health and safety (WHS) and occupational health and safety (OHS) requirements relating to diagnosing and repairing light vehicle hydraulic braking systems, including procedures for:

lifting and supporting light vehicles

handling and controlling brake dust and brake fluids

environmental requirements, including procedures for trapping, storing and disposing of brake dust and brake fluid released from hydraulic braking systems

operating principles of light vehicle hydraulic braking systems and associated components, including:

levers

friction

hydraulics, including the relationship between force, pressure and area

properties of brake fluids, including:

Department of Transportation (DOT) classification

synthetic and non-synthetic

compatibility of fluid types

application, purpose and operation of light vehicle hydraulic braking systems and components, including:

front and rear split systems

diagonal split systems

master cylinders, including:

tandem master cylinders

compensating-type master cylinders

centre-valve master cylinders

drum braking system and components, including:

self-energising or servo effect

leading and trailing shoe braking systems

duo-servo braking systems

two-leading shoe braking systems

wheel cylinders

manual and self-adjustment systems of drum braking systems

disc braking systems and components, including:

types of brake discs

disc pads

self-adjustment of disc pads

fixed, floating and dual-piston brake calipers

parking brake systems and components, including:

parking brake levers

drum parking brakes

disc parking brakes

electronic parking brake systems

braking system valves and switches, including:

pressure differential valves and switches

proportioning valves

load-sensing proportioning valves

drum brake check valves

fluid-level warning devices

vacuum operated brake boosting systems

diagnostic testing procedures for light vehicle hydraulic braking systems, including procedures for:

checking brake pedal

operational tests of brake booster

operational tests of master cylinder

testing brake fluid

operational tests of hand brake

operational tests of drum and disc brakes

measuring and evaluating brake drums, shoes, discs and pads

repair procedures for light vehicle hydraulic braking systems, including procedures for:

removing, replacing and adjusting hydraulic system components, including master cylinder, proportioning valves, switches, brake hoses and lines, disc calipers and wheel cylinders

removing, replacing and adjusting braking system components, including brake booster, master cylinder, hand brake lever and cables, brake shoes and drums, brake pads and brake discs

bleeding brakes, including anti-lock braking systems (ABS)

post-repair testing procedures for light vehicle hydraulic braking systems, including procedures for road testing and bedding in brakes.


Assessment Conditions

Assessors must satisfy NVR/AQTF assessor requirements.

Competency is to be assessed in the workplace or a simulated environment that accurately reflects performance in a real workplace setting.

Assessment must include direct observation of tasks.

Where assessment of competency includes third-party evidence, individuals must provide evidence that links them to the light vehicle hydraulic braking systems that they have worked on, e.g. repair orders.

Assessors must verify performance evidence through questioning on skills and knowledge to ensure correct interpretation and application.

The following resources must be made available:

automotive repair workplace or simulated workplace

workplace instructions

manufacturer braking system specifications

two different light vehicles with four-wheel hydraulic disc brake systems with faults

one light vehicle with a rear drum brake system

diagnostic equipment for light vehicle hydraulic braking systems

tools, equipment and materials appropriate for repairing light vehicle braking systems.


Foundation Skills

This section describes those language, literacy, numeracy and employment skills that are essential to performance and are not explicit in the performance criteria.

Skills

Description

Learning skills to:

locate appropriate sources of hydraulic braking system information efficiently.

Reading skills to:

interpret information from manufacturer and workshop literature when seeking hydraulic braking system specifications and procedures.

Writing skills to:

legibly and accurately fill out workplace documentation when reporting diagnostic findings, making repair recommendations, and recording parts and material used.

Oral communication skills to:

clarify instructions

report diagnostic findings and make repair recommendations.

Numeracy skills to:

measure braking system components and use basic mathematical operations, including addition and subtraction, to calculate distances, tolerances and deviations from manufacturer specifications.

Planning and organising skills to:

plan own work requirements and prioritise actions to achieve required outcomes and ensure tasks are completed within workplace timeframes.

Technology skills to:

use hydraulic braking system measuring equipment, such as vernier calipers, micrometers and brake drum micrometers.


Range Statement

This section specifies work environments and conditions that may affect performance. Essential operating conditions that may be present (depending on the work situation, needs of the candidate, accessibility of the item, and local industry and regional contexts) are included. Bold italicised wording, if used in the performance criteria, is detailed below.

Safety and environmental requirements must include:

work health and safety (WHS) and occupational health and safety (OHS) requirements, including procedures for:

lifting and supporting light vehicles

handling and controlling brake dust and brake fluids

environmental requirements, including procedures for trapping, storing and disposing of brake dust and brake fluid released from hydraulic braking systems.


Sectors

Technical - Brakes


Competency Field

Mechanical - Light Vehicle