Texas CDL Air Brakes
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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.
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Study online at https://quizlet.com/_5olut5
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.
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