PSI's
At what pressure is the governor cut in?
100 PSI
How often should you drain your air tanks?
Daily
What does the air compressor do?
Pumps air into the storage tanks
What is an application pressure guage?
Shows how much pressure you are applying to the service brake
What are foundation brakes?
At what pressure is the governor cut out?
125 PSI
How do you test the low pressure warning?
Fan the brakes down to 60 PSI
What does the air compressor governor do?
Controls when the compressor will pump air inot the storage tanks
What is the difference in the parking and emergency brake?
Parking brakes are set by the driver using the controls in the cab. Emergency brakes automatically apply in the event of pressure loss
What is the most common foundation brake?
S-Cam
What pressure does the low pressure warning come on?
60 PSI
How do you test the emergency brakes?
Fan the brake down to 20-45 PSI
What two things are required on a vehicle with air brakes?
Low pressure warning
Supply gauge
What is the stop light switch and what controls it?
Electric switch controlled by air pressure that causes the brake lights to light up when the brake pedal is pushed
What is the service brake?
Foot pedal
At what pressure do the emergency brake set?
20-45 PSI
How do you test the spring brakes?
With the spring brakes set, put the vehicle in a low gear and pull forward against them. It should not move
What keeps air in the system should the compressor develop a leak?
One way check valve
What is a wig-wag?
Low air pressure warning formerly used on buses
What is the maximum pressure loss in one minute in a single vehicle with the spring brakes released?
2 PSI
At what pressure does the safety valve release?
150 PSI
Explain how to check slack adjusters
Park on level ground, chock the wheels, release the brakes, pull on each slack adjuster, should not move more than one inch
What keeps air in the system should the trailer break away or develop a bad leak?
Tractor protection valve
What is a dual parking brake control?
Used to move the vehicle a short distance in the event of an emergency
What is brake fade?
Applying the brakes harder and harder to get the same stopping power