© 2006 psen unit - #6 air brake system understanding the design of the air brake system and an...
TRANSCRIPT
© 2006 PSEN
Unit - #6 Air Brake System
• Understanding the design of the Air Brake System and an overview of the Engine Retarder System
© 2006 PSEN
Brake SystemsBrake Systems
• Braking System• Braking System
• Air Storage Tank's• Air Compressor• Compressor Governor
• Air Storage Tank's• Air Compressor• Compressor Governor
1. Service Brake
2. Parking Brake
3. Emergency Brake
1. Service Brake
2. Parking Brake
3. Emergency Brake
© 2006 PSEN
• Brake pedal application is critical to a reliable air brake system response
• Brake pedal application is critical to a reliable air brake system response
Brake Pedal
© 2006 PSEN
© 2006 PSEN
AIR TANKAIR TANK
Manual Draining Valve
Manual Draining Valve
Air Brake ComponentsAir Brake Components
© 2006 PSEN
Gauge DisplayGauge Display
Supply Pressure Gauges
Rear
Front
© 2006 PSEN
• 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
• 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
Parking Brake Control Parking Brake Control
© 2006 PSEN
• 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.
• 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.
Parking Brake Control Parking Brake Control
© 2006 PSEN
• Knob “pushed in” fills the air storage tank(s) – compresses the brake springs – releases pads from rotor or drums and the vehicle moves.
• Knob “pushed in” fills the air storage tank(s) – compresses the brake springs – releases pads from rotor or drums and the vehicle moves.
Spring BrakesSpring Brakes
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.
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.
© 2006 PSEN
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.
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.
Air Brake TestAir Brake Test
© 2006 PSEN
Air System RefillingAir System Refilling
Refill BrakesRefill Brakes
© 2006 PSEN
• 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.
• 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.
Dual Parking Control ValveDual Parking Control Valve
© 2006 PSEN
Front Brake Limiting SwitchFront 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
• Limiting valves are used to reduce the chance of front wheel skidding on slippery surfaces
• Braking is good under all conditions
© 2006 PSEN
Front Brake Limiting SwitchFront 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
• Limiting valves are used to reduce the chance of front wheel skidding on slippery surfaces
• Braking is good under all conditions
© 2006 PSEN
• 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
• 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
Anti-Lock BrakesAnti-Lock Brakes
© 2006 PSEN
• 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.
• 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.
Engine RetardersEngine Retarders
© 2006 PSEN
• 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.
• 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.
Engine RetardersEngine Retarders
© 2006 PSEN
Unit - #6 Air Brake System