Braking Systems
MODULE 1 - BRAKING SYSTEMS
Introduction and definitions
Legal requirements
- SABS Specifications for brakes
- Brakes on heavy trucks, buses and semi-trailers
- Brakes on trailers
- Braking performance of service, emergency and parking brakes
- Braking performance requirements
- Compliance
- Compatibility
- Condition and operation of brakes
- SABS 047 rejection criteria
Energy and motion
Air brake systems
- Heavy vehicle air brake system components
- Compressed air brake systems
- Energy supply
- Control
- Transmission
- Identification of port connections (DIN ISO 6786)
- Port numbers used in air brake systems
Description of system changes brought about by SABS 1506
- Pre-SABS 1506
- Systems complying with SABS 1506 requirements
- Hand control valves
- The trailer system
Foundation brakes and retarders
- Drum brakes
- Disc brakes
- Slack adjusters
Friction
Endurance and engine brakes
- Driveline retarders
- Engine brakes
- Jacobs (Jake) brakes
Air brake system component operating principles
- Compressed air supply
- Compressors
- Safety valve
- Unloader valve
- Governor valve
- Low pressure warning switch
- Sensing (Wet) tank
- Air dryer
- Multi-circuit (4-way) protection valve
- Air reservoir
- Foot brake valve
- Relay valve
- Quick-release valve
- Automatic load-sensing valve
- Relay load-sensing valve
- Pressure regulating valve
- Trailer control valve
- Semi-trailer parking hand control
- Line filter
- Brake chamber
- Spring brake actuator
- Air tank storage capacities
- Service brake system
- Parking brake system
- Emergency braking (secondary) system
- Trailer control
- Trailer parking
Air-over-hydraulic brake systems
- The hydraulic braking system
- Single circuit hydraulic brake master cylinder
- Dual circuit (tandem) hydraulic brake master cylinder
- The air system
Electronic braking control (ABS-EBS)
Maintenance, testing and fault diagnosis
- Points a driver and mechanic should know and do on twin-line air brakes
- Diagnosing brake faults
- Preliminary checks
- Brake assembly checks
- Adjusting air brakes
- KNORR BREMSE wear limits of pads and discs
- Air compressor maintenance
- Air tank (reservoir) maintenance
- Air dryer maintenance
- Build-up times and leakage rates
- Testing air brake systems
- Air-over-hydraulic system maintenance
- (F & H) air suzie couplings
- Measuring shut-off valve lift
Roadworthy testing of air brake systems
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