1. Unit - #6 Air Brake System
Understanding the design of the Air Brake System and an overview of the Engine Retarder System

2. Brake Systems Braking System Service Brake Parking Brake
Emergency Brake
Air Storage Tank's
Air Compressor
Compressor Governor

3. Brake Pedal
Brake pedal application is critical to a reliable air brake system response

5. Air Brake Components
AIR TANK
Manual Draining Valve

6. Gauge Display
Supply Pressure Gauges
Rear
Front

7. Parking Brake Control
NEVER push the brake pedal down when the spring brakes are on.
Don’t use the brakes if they are very hot
In freezing temperatures they can freeze

8. Parking Brake Control Use wheel chocks to hold the vehicle.
Let hot brakes cool before using the parking brake.
If the brakes are wet, use light braking while driving in a low gear to heat and dry them.

9. Spring Brakes
Knob “pushed in” fills the air storage tank(s) – compresses the brake springs – releases pads from rotor or drums and the vehicle moves.
Pulling the knob releases air from the air storage tank(s) - brake springs decompress or expand – brake pads play pressure on the rotors / drums and we slow down and / or stop.

10. Air Brake Test External – Chock your wheels Internal –
Vehicle in NEUTRAL
Release you AIR BRAKE
Pump your Service Brake
Note Air Gauge indicators
Determine lower pressure reading that activates the brake automatically.

11. Refill Brakes
Air System Refilling

12. Dual Parking Control Valve
When you push the brake control “in”, air from a separate tank releases the spring brakes so you can move the vehicle in an emergency.

13. Front Brake Limiting Switch
NORMAL SLIPPERY
Limiting valves are used to reduce the chance of front wheel skidding on slippery surfaces
Braking is good under all conditions

14. Front Brake Limiting Switch
NORMAL SLIPPERY
Limiting valves are used to reduce the chance of front wheel skidding on slippery surfaces
Braking is good under all conditions

15. Anti-Lock Brakes Purpose is to:
Prevent the tires from locking under any conditions
When making an emergency stop using an ABS the driver should maintain pressure on the brake pedal even if the pedal starts to pulsate

16. Engine Retarders Several different types: Engine Exhaust Transmission
Slows the rear axle with some type of braking mechanism, that does not involve use of the regular service brake.

17. Engine Retarders
If the roads are clean and dry the retarder can be used at any of the available settings.
Do not use on a slippery road
If the vehicle drive wheels begin to lock or the rear end begins to fishtail, immediately turn off the retarder system.

18. Unit - #6 Air Brake System