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Elements and Performance Criteria

  1. Prepare to diagnose and repair air braking system
  2. Diagnose air braking system
  3. Repair air braking system
  4. Complete work processes
  5. Prepare to diagnose and repair air braking system
  6. Diagnose air braking system
  7. Repair air 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 pressure 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 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, emergency 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 three heavy vehicle air braking systems as follows:

one disc braking system, in which the work must involve removing and refitting or replacing the brake actuators, disc pads and disc rotors

one drum braking system, in which the work must involve removing and refitting or replacing the brake actuators, brake shoes and drums

one air braking system, in which the work must involve removing and refitting or replacing the following:

air compressor, delivery and storage components

slack adjusters

pneumatic and electronic control circuits and valves.


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

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

operating principles of air braking systems and associated components, including:

levers

friction

pneumatics

electronics

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

disc braking systems

drum braking systems

air compressors, air storage, air dryers and valves

brake actuators

foot valves

air control valves

manual and automatic slack adjusters

trailer brake valves

pneumatic and electronic control circuits and valves

diagnostic testing procedures for air braking systems, including:

air control system testing

air brake component inspection and evaluation

brake system stationary and mobile performance tests

repair procedures for air braking system components, including:

wheel end components, including:

disc braking systems

drum braking systems

air compressors, air storage, air dryers and valves

brake actuators

foot valves

manual and automatic slack adjusters

trailer brake valves

pneumatic and electronic control circuits and valves

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