Texas CDL Air Brakes, TX CDL #3- Air Brakes- Section 5, CDL Air Brakes 2
Study online at https://quizlet.com/_53nx61
1. Air brake systems combine what three different systems?: Service brakes,
parking brakes and emergency brakes.
2. When should you drain the air tanks?: After every working day.
3. Why drain water from the compressed air tanks?: Water can freeze in cold
weather and cause brake failure.
4. Air brake equipped vehicles must have:: A supply pressure gauge and warning
signal when psi drops below 60.
5. What can legally hold a parking or emergency brake in position for a truck,
truck tractor or bus?: Spring pressure.
6. What makes the total stopping distance for air brakes longer than that for
hydraulic brakes?: Brake lag distance.
7. The first thing you should do when the low air pressure warning comes
on?: Stop and safely park ASAP.
8. The braking power of the spring brakes:: Depends on the adjustment of the
service brakes.
9. The air compressor governor controls what?: When air is pumped into the air
tanks.
10. The application pressure gauge shows the driver how much pressure:: Is
being applied to the brakes.
11. When you apply pressure to the brake pedal, you are...: Pushing against a
spring and against air pressure to the brakes.
12. The air compressor is connected to the engine through...: Gears or a V-belt
13. Which type of brake is the most common in commercial vehicles?: S-cam
brake
14. An application pressure gauge...: Shows how much air pressure you are
applying to the brakes.
15. All vehicles with air brakes are required to have a low pressure warning
signal. This could be...: A red light, wig wag mechanical arm or a buzzer.
16. To test service brakes you should...: Release the parking brake, move forward
slowly and depress brakes.
17. Stab braking occurs when you...: 1. Press on a brake pedal as hard as you
can. 2. Release the brakes when the wheels lock up. 3. Apply the brakes when the
wheels start rolling.
18. Air brakes take longer to stop than hydraulic brakes because...: It takes
longer for the air to flow through the lines.
19. The proper way to go down long grades is to...: Apply brakes just hard
enough to reduce speed to 5 mph below safe speed then release until back to safe
speed and repeat process.
20. When should you avoid using the parking brake?: When the brakes are hot.
, Texas CDL Air Brakes, TX CDL #3- Air Brakes- Section 5, CDL Air Brakes 2
Study online at https://quizlet.com/_53nx61
21. If your vehicle has an alcohol evaporator, everyday during cold weather
you should:: Check and fill the alcohol level.
22. During normal driving, spring brakes are usually he'd back by what?: Air
pressure
23. In air brake vehicles, the parking brakes should be used when?: Whenever
the vehicle is parked.
24. The brake pedal in an air brake system does what?: Controls the air pressure
applied to put on the brakes.
25. If your bus has dual parking control valves it means that you can use
pressure from a separate tank to:: Release the spring brakes to move a short
distance.
26. A straight truck or bus air brake system should not leak at a rate of more
than ____ PSI per minute with the engine off and the brakes released.: 2
27. An alcohol evaporator does what?: Reduces the risk of ice in the air brake
valves in cold weather.
28. If you must make an emergency stop, you should brake so that you:: Stay
in a straight line and can steer.
29. Air loss should not be more than ___ with the engine off and brakes
released.: 2 psi per minute
30. Stab braking: Brake as hard and you can, get off the the breaks when wheels
are locked, get back on the brakes when wheels start rolling again.
31. How do you know when your brakes are fading?: You have to push harder
on the brake pedal to control your speed on a downgrade.
32. To check the free play of manual slack adjusters on s-can brakes you
should:: Park on a level ground, chock wheels, and release parking brake.
33. If the air compressor should develop a leak, what keeps the air in the
tanks?: The one way check valve.
34. When driving down a long steep hill you should:: Release the brake when
you are 5 mph below you safe speed.
35. The brake system that applies and releases the brakes when a driver uses
the brake pedal is the:: Service brake system.
36. The most common type of foundation brakes found on heavy vehicles is
the:: S-can drum
37. Vehicles with air brakes must have:: An air pressure gauge to show the
pressure available for braking.
38. Air brakes should be drained...: 1. At the end of each working day. 2. To keep
sludge from clogging system valves.
3. Manually when automatic devices fail.
39. Fanning air brakes...: Decreases the air pressure.
Study online at https://quizlet.com/_53nx61
1. Air brake systems combine what three different systems?: Service brakes,
parking brakes and emergency brakes.
2. When should you drain the air tanks?: After every working day.
3. Why drain water from the compressed air tanks?: Water can freeze in cold
weather and cause brake failure.
4. Air brake equipped vehicles must have:: A supply pressure gauge and warning
signal when psi drops below 60.
5. What can legally hold a parking or emergency brake in position for a truck,
truck tractor or bus?: Spring pressure.
6. What makes the total stopping distance for air brakes longer than that for
hydraulic brakes?: Brake lag distance.
7. The first thing you should do when the low air pressure warning comes
on?: Stop and safely park ASAP.
8. The braking power of the spring brakes:: Depends on the adjustment of the
service brakes.
9. The air compressor governor controls what?: When air is pumped into the air
tanks.
10. The application pressure gauge shows the driver how much pressure:: Is
being applied to the brakes.
11. When you apply pressure to the brake pedal, you are...: Pushing against a
spring and against air pressure to the brakes.
12. The air compressor is connected to the engine through...: Gears or a V-belt
13. Which type of brake is the most common in commercial vehicles?: S-cam
brake
14. An application pressure gauge...: Shows how much air pressure you are
applying to the brakes.
15. All vehicles with air brakes are required to have a low pressure warning
signal. This could be...: A red light, wig wag mechanical arm or a buzzer.
16. To test service brakes you should...: Release the parking brake, move forward
slowly and depress brakes.
17. Stab braking occurs when you...: 1. Press on a brake pedal as hard as you
can. 2. Release the brakes when the wheels lock up. 3. Apply the brakes when the
wheels start rolling.
18. Air brakes take longer to stop than hydraulic brakes because...: It takes
longer for the air to flow through the lines.
19. The proper way to go down long grades is to...: Apply brakes just hard
enough to reduce speed to 5 mph below safe speed then release until back to safe
speed and repeat process.
20. When should you avoid using the parking brake?: When the brakes are hot.
, Texas CDL Air Brakes, TX CDL #3- Air Brakes- Section 5, CDL Air Brakes 2
Study online at https://quizlet.com/_53nx61
21. If your vehicle has an alcohol evaporator, everyday during cold weather
you should:: Check and fill the alcohol level.
22. During normal driving, spring brakes are usually he'd back by what?: Air
pressure
23. In air brake vehicles, the parking brakes should be used when?: Whenever
the vehicle is parked.
24. The brake pedal in an air brake system does what?: Controls the air pressure
applied to put on the brakes.
25. If your bus has dual parking control valves it means that you can use
pressure from a separate tank to:: Release the spring brakes to move a short
distance.
26. A straight truck or bus air brake system should not leak at a rate of more
than ____ PSI per minute with the engine off and the brakes released.: 2
27. An alcohol evaporator does what?: Reduces the risk of ice in the air brake
valves in cold weather.
28. If you must make an emergency stop, you should brake so that you:: Stay
in a straight line and can steer.
29. Air loss should not be more than ___ with the engine off and brakes
released.: 2 psi per minute
30. Stab braking: Brake as hard and you can, get off the the breaks when wheels
are locked, get back on the brakes when wheels start rolling again.
31. How do you know when your brakes are fading?: You have to push harder
on the brake pedal to control your speed on a downgrade.
32. To check the free play of manual slack adjusters on s-can brakes you
should:: Park on a level ground, chock wheels, and release parking brake.
33. If the air compressor should develop a leak, what keeps the air in the
tanks?: The one way check valve.
34. When driving down a long steep hill you should:: Release the brake when
you are 5 mph below you safe speed.
35. The brake system that applies and releases the brakes when a driver uses
the brake pedal is the:: Service brake system.
36. The most common type of foundation brakes found on heavy vehicles is
the:: S-can drum
37. Vehicles with air brakes must have:: An air pressure gauge to show the
pressure available for braking.
38. Air brakes should be drained...: 1. At the end of each working day. 2. To keep
sludge from clogging system valves.
3. Manually when automatic devices fail.
39. Fanning air brakes...: Decreases the air pressure.
