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Elements and Performance Criteria

  1. Prepare to diagnose and repair heavy vehicle hydraulic and air over hydraulic braking system
  2. Diagnose braking system
  3. Repair braking system
  4. Complete work processes
  5. Prepare to diagnose and repair heavy vehicle hydraulic and air over hydraulic braking system
  6. Diagnose braking system
  7. Repair braking system
  8. Complete work processes

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.

Diagnostic tests must include:

friction material wear

drum brake component serviceability

disc brake component serviceability

air braking system testing

hydraulic braking system testing.

Safety and environmental requirements must include:

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

working safely with stored energy in springs and high air pressure systems

managing and controlling brake dust and brake fluids

removing and refitting wheel assemblies

environmental requirements, including procedures for trapping, storing and disposing of hazardous materials and substances released from braking systems, including brake fluids and brake dust and fibres.

Repair information must include procedures relating to:

removing, replacing and adjusting system components

dismantling, repairing, reassembling and adjusting systems.

Post-repair testing must include:

stall testing of service, park and secondary brakes

dynamic brake performance testing using approved methods or equipment.


Performance Evidence

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 a heavy vehicle hydraulic braking system, including:

master cylinder and wheel cylinders

disc and drum brake wheel end components

parking brake

diagnose and repair a fault in a heavy vehicle air over hydraulic braking system, including:

disc and drum brake wheel end components

air compressor, delivery and storage components

foot valves

parking brake.


Knowledge Evidence

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 heavy vehicle hydraulic and air over hydraulic braking systems, including procedures for:

working safely with stored energy in springs and high air pressure systems

managing and controlling brake dust and brake fluids

removing and refitting wheel assemblies

environmental procedures for trapping, storing and disposing of hazardous materials and substances released from braking systems, including brake fluids and brake dust and fibres

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

levers

friction

pneumatics

hydraulics

Australian Design Rules ADR35 and ADR38 relating to repairing heavy vehicle brakes

application, purpose and operation of heavy vehicle hydraulic and air over hydraulic braking systems and components, including:

hydraulic braking systems, including:

disc and caliper assemblies

drum and lining assemblies

master cylinder and boosters

brake lines and hydraulic valves

load compensating valves

proportioning valves

air over hydraulic braking systems, including:

air storage

brake valves

air compressor

brake lines and valves

receiver drier

parking brake systems

diagnostic testing procedures for heavy vehicle hydraulic and air over hydraulic braking systems, including:

air control system tests

hydraulic system component inspection and evaluation

air braking system component inspection and evaluation

brake fluid tests

parking brake operational tests

drum and disc brake operational tests

drum brake and shoes, disc and pad measurement and evaluation

stationary and mobile performance tests

repair procedures for heavy vehicle hydraulic and air over hydraulic braking systems, including:

removal, replacement and adjustment procedures for hydraulic system components, including:

disc and caliper assemblies

drum and lining assemblies

master cylinder and boosters

brake lines and valves

switches

removal, replacement and adjustment procedures for hydraulic and air over hydraulic braking system components, including:

brake valves

air compressors

air storage

brake lines and valves

receiver driers

post-repair testing procedures for heavy vehicle hydraulic and air over hydraulic braking systems, including stationary and mobile performance tests.