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FREE AND STUDY GAMES ABOUT AIR BRAKES CDL ***
EXAM QUESTIONS
Actual Qs and Ans Expert-Verified Explanation
This Exam contains:
-Guarantee passing score -29 Questions and Answers -format set of multiple-choice -Expert-Verified Explanation Question 1: Air loss in a straight truck or bus should not be more than ____ with the engine off and the brakes on.
Answer:
- psi in one minute
Question 2: If you must make an emergency stop, you should brake so that you:
Answer:
Stay in a straight line and can steer.Question 3: In air brake vehicles, the parking brakes should be used:
Answer:
Whenever the vehicle is parked.Question 4: To check the free play of manual slack adjusters on s-cam brakes you should:
Answer:
Park on level ground, chock the wheels, and release the parking brakes.
Question 5: Vehicles with air brakes must have:
Answer:
An air pressure gauge to show the pressure available for braking.Question 6: If your vehicle has an alcohol evaporator, every day during cold weather you
should:
Answer:
Check and fill the alcohol level.Question 7: When driving down a long steep hill you should:
Answer:
Release the brake when you are 5 M.P.H. below your safe speed.Question 8: Your truck or bus has a dual air brake system. If a low air pressure warning comes on for only one system, what should you do?
Answer:
Stop. Safely park, and continue only after the system is fixed.Question 9: You should know that your brakes are fading when:
Answer:
You have to push harder on the brake pedal to control your speed on a downgrade.Question 10: If the air compressor should develop a leak, what keeps the air in the tanks?
Answer:
The one way check valve Question 11: The application pressure gauge shows the driver how much pressure:
Answer:
Is being applied to the brakes.Question 12: The driver must be able to see a warning that is given before air pressure in the
service air tanks falls below:
Answer:
60 psi
Question 13: If your truck or bus has dual parking control valves it means that you can use
pressure from a separate tank to:
Answer:
Release the spring brakes to move a short distance.Question 14: Air brake equipped vehicles must have:
Answer:
A supply pressure gauge.Question 15: The brake pedal in an air brake system:
Answer:
Controls the air pressure applied to put on the brakes.Question 16: To make an emergency stop with air brakes, using the stab braking method, you
should:
Answer:
Brake as hard as you can, get off the brakes when the wheels lock, get back on the brakes when the wheels start rolling again.
Question 17: Why drain water from the compressed air tanks?
Answer:
Water can freeze in cold weather and cause brake failure.Question 18: Which of the following makes the total stopping distance for air brakes longer than that for hydraulic brakes.
Answer:
Brake lag distance.Question 19: Modern air brake systems combines three different systems. The are the service
brakes, the parking brakes and the:
Answer:
Emergency brakes.
Question 20: During normal driving, spring brakes are usually held back by:
Answer:
Air pressure Question 21: The brake system that applies and releases the brakes when the driver uses the
brake pedal is the:
Answer:
Service brake system.Question 22: The braking power of the spring brakes:
Answer:
Depends on the adjustment of the service brakes.Question 23: 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.
Answer:
2 Question 24: What can legally hold a parking or emergency brake in position for a truck, truck tractor or bus?
Answer:
Spring pressure Question 25: The air compressor governor controls:
Answer:
When air is pumped into the air tanks.Question 26: Oil and water usually collect in compressed air tanks. If you do not have an automatic tank drain, when should you drain the air tanks?
Answer:
After every working day.Question 27: The most common type of foundation brakes found on heavy vehicles is the:
Answer:
S-cam drum
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