Texas CDL Air Brakes
Study online at https://quizlet.com/_6s9bvs
1. Air Brakes...: Use compressed air to make the brakes work- good for stopping
large and heavy vehicles
2. 3 Different Braking Systems: Service Brake, Parking Brake, and Emergency
Brake
3. Service Brake System: applies and releases the brakes by using the brake pedal
during normal driving
4. Parking Brake System: Applies and releases the parking brakes when you use
the parking brake control
5. Emergency Brake System: Uses parts of the service and parking brake system
to stop the vehicle in event of a brake system failure.
6. Air Compressor: pumps air into the storage tanks
7. How is the air compressor connected to the engine?: Through gears or a
v-belt.
8. If the compressor has its own oil supply: check the oil every day before driving
9. Air Compressor Governor: Controls when the air compressor will pump air into
the air storage tanks
10. Air Tank pressure cut out level: 125 psi (pounds per square inch)
11. When air tank pressure rises to the "cut-out" level: the governor stops the
compressor from pumping air
12. Air Tank pressure cut in level: 100 psi
13. When does the compressor start pumping again?: When the air tank pres-
sure falls to the cut in level
14. Air storage tanks: Hold Compressed Air- enough air to allow the brakes to be
used several times
15. Air Tank Drains: Allows the storage tanks to be drained of oil and water, to
prevent frozen air lines/brake failure.
16. What is bad for the air brake system?: compressed air usually has some water
and some compressor oil in it
17. Manually and Automatically: Two ways to drain air tanks- drain valve in bottom
18. Manually draining: Quarter turn or pulling a cable- every day
19. Automatic Draining: Water and oil are automatically drained for you
20. Automatic tank drains also have: electric heating devices- prevent freezing of
drain in cold weather
21. Alcohol Evaporator: puts alcohol into the air system to reduce the risk of ice
-Check and fill up as necessary, every day in cold weather
22. Safety Valve: protects the tank and system from too much pressure
usually set to open at 150 psi
23. Brake Pedal: AKA foot valve or treadle valve
24. Pushing down brake pedal harder: applies more air pressure
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Study online at https://quizlet.com/_6s9bvs
1. Air Brakes...: Use compressed air to make the brakes work- good for stopping
large and heavy vehicles
2. 3 Different Braking Systems: Service Brake, Parking Brake, and Emergency
Brake
3. Service Brake System: applies and releases the brakes by using the brake pedal
during normal driving
4. Parking Brake System: Applies and releases the parking brakes when you use
the parking brake control
5. Emergency Brake System: Uses parts of the service and parking brake system
to stop the vehicle in event of a brake system failure.
6. Air Compressor: pumps air into the storage tanks
7. How is the air compressor connected to the engine?: Through gears or a
v-belt.
8. If the compressor has its own oil supply: check the oil every day before driving
9. Air Compressor Governor: Controls when the air compressor will pump air into
the air storage tanks
10. Air Tank pressure cut out level: 125 psi (pounds per square inch)
11. When air tank pressure rises to the "cut-out" level: the governor stops the
compressor from pumping air
12. Air Tank pressure cut in level: 100 psi
13. When does the compressor start pumping again?: When the air tank pres-
sure falls to the cut in level
14. Air storage tanks: Hold Compressed Air- enough air to allow the brakes to be
used several times
15. Air Tank Drains: Allows the storage tanks to be drained of oil and water, to
prevent frozen air lines/brake failure.
16. What is bad for the air brake system?: compressed air usually has some water
and some compressor oil in it
17. Manually and Automatically: Two ways to drain air tanks- drain valve in bottom
18. Manually draining: Quarter turn or pulling a cable- every day
19. Automatic Draining: Water and oil are automatically drained for you
20. Automatic tank drains also have: electric heating devices- prevent freezing of
drain in cold weather
21. Alcohol Evaporator: puts alcohol into the air system to reduce the risk of ice
-Check and fill up as necessary, every day in cold weather
22. Safety Valve: protects the tank and system from too much pressure
usually set to open at 150 psi
23. Brake Pedal: AKA foot valve or treadle valve
24. Pushing down brake pedal harder: applies more air pressure
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