- Study guides, Class notes & Summaries

How would you check your truck's slack adjusters? - Accelerate and then brake hard. - Press the brake pedal while listening for any strange noises. - Use gloves and pull hard on each slack adjuster you can reach. - All of the above are correct. - ANSWER - Use gloves and pull hard on each slack adjuster you can reach Under which conditions are front wheel brakes good? - None - All weather conditions - Wet or icy conditions only - Good weather only - ANSWER - All weather condit...

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17 pages

Written in 2025/2026

Grade A+

shantelleG

All vehicles with air brakes are required to have a low pressure warning signal. This could be... A) a red light B) a wig wag mechanical arm C) a buzzer D) any of the above - ANSWER D To test the low pressure warning signal, you should do all BUT the following... A) shut the engine off B) turn the electrical power on C) ask a friend to listen for the signal D) step on and off the brake pedal to reduce air pressure - ANSWER C If your truck or bus has dual parking control valves it...

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6 pages

Written in 2025/2026

Grade A+

shantelleG

64EDS1) Why must air tanks be drained? a) For pre trip inspection purposes b) To check for leaks c) To release oil and water buildup d) To activate the low air pressure alarm - ANSWER c) To release oil and water buildup 2) What is a supply pressure gauge used for? a) To check tire pressure b) To check tank pressure c) To activate the low pressure alarm d) To check for leaks - ANSWER b) To check tank

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13 pages

Written in 2025/2026

Grade A+

shantelleG

Which of the following is true about your brake function if your ABS fails? 1. you will still have normal brake function, but you will need to get the ABS repaired soon 2. you will have no brake function and the truck will be out of control 3. it will slow your truck to a halt and force you to pull over 4. it may cause problems with other mechanical systems, and there could be a huge fire risk - ANSWER you will still have normal brake function, but you will need to get the ABS repaired ...

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4 pages

Written in 2025/2026

Grade A+

shantelleG

In air brake vehicles, the parking brakes should be used: - ANSWER Any time the vehicle is parked. If your antilock braking system is not working, you should: - ANSWER Drive normally, but get the system serviced soon Excessive use of the service brakes result in overheating, which can lead to: - ANSWER Expansion of the brake drums

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6 pages

Written in 2025/2026

Grade A+

shantelleG

Which of the following can cause air brakes to fail or fade? (A) Brakes being out of adjustment (B) Excessive use of the service brakes (C) Not relying on engine braking enough (D) All of the above - ANSWER (D) All of the above When should you drain your air tanks? (A) At the end of the month (B) At the end of the fiscal quarter

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5 pages

Written in 2025/2026

Grade A+

shantelleG

If your vehicle has an alcohol evaporator, it is there to: A. Rid the wet tank of alcohol that condenses and sits at the bottom B. Eliminate the need for daily tank draining C. Reduce the risk of ice in air brake valves in cold weather - ANSWER C. Reduce the risk of ice in air brake valves in cold weather. The application pressure gauge shows how much air pressure you: A. Have in the air tanks B. Have in the modulating control valve C. Are applying to the brakes - ANSWER C. Are a...

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7 pages

Written in 2025/2026

Grade A+

shantelleG

A low air pressure warning signal should activate - ANSWER When tank pressure falls below 60 psi. In an air brake system, a low air pressure warning signal must come on if air pressure in the tanks falls below 60 psi. This warning signal may come in the form of a light, a buzzer, or a wig wag.

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4 pages

Written in 2025/2026

Grade A+

shantelleG

Air brake systems combine what three different systems? - ANSWER Service brakes, parking brakes and emergency brakes. When should you drain the air tanks? - ANSWER After every working day. Why drain water from the compressed air tanks? - ANSWER Water can freeze in cold weather and cause brake failure.

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5 pages

Written in 2025/2026

Grade A+

shantelleG

3 different braking systems that make up Air Brakes - ANSWER Service Brake, Parking Brake, Emergency Brake Air Compressor - ANSWER Pumps air into storage tanks and connected to the engine via gears or a v-belt.

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4 pages

Written in 2025/2026

Grade A+

shantelleG

1. Air loss in a straight truck or bus should not be more than ____ with the engine off and the brakes on. - ANSWER 3 psi in one minute 2. To make an emergency stop with air brakes, using the stab braking method, you should: - ANSWER C Brake as hard as you can, get off the brakes

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2 pages

Written in 2025/2026

Grade A+

shantelleG

If your truck has a dual air system and one of the systems is low on pressure: - ANSWER Either the front or rear brakes will not be fully functional If your truck has a dual air brake system, and one of the systems is low on pressure: - ANSWER Either the front or rear brakes will not be operational

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2 pages

Written in 2025/2026

Grade A+

shantelleG

The parking break or emergency brake on a heavy vehicle can only be held in position by something that cannot leak away, like: - ANSWER Spring Pressure A straight truck or bus air break system should not leak at a rate of more than _________ PSI per minute with the engine OFF and the brakes RELEASED. - ANSWER 2

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3 pages

Written in 2025/2026

Grade A+

shantelleG

In air brake vehicles, the parking brake should be used: - ANSWER any time the vehicle is parked Repeatedly pressing and releasing (fanning) the brake pedal may result in: - ANSWER the loss of brake pressure

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4 pages

Written in 2025/2026

Grade A+

shantelleG

To test air service brakes you should: - ANSWER Brake firmly while slowly moving forward The driver must be able to see a low air pressure warning which comes on before pressure in the service air tanks falls below ____ psi - ANSWER 60 If your vehicle has an alcohol evaporator, every day during cold weather you should: - ANSWER Check and fill the alcohol level

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6 pages

Written in 2025/2026

Grade A+

shantelleG

CDL AIR BRAKES TEST PRACTICE EXAM QUESTIONS AND CORRECT ANSWERS (VERIFIED ANSWERS) PLUS RATIONALES 2025

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33 pages

Written in 2024/2025

Grade A+

TheExamWhisperer

CDL Air Brakes Exam | Questions with Correct Answers | 100% Pass

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11 pages

Written in 2024/2025

Grade A+

ExamsCollection

CDL Air Brakes Exam | Questions with Correct Answers | 100% Pass

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16 pages

Written in 2024/2025

Grade A+

ExamsCollection

CDL - Air Brakes Exam Questions And Answers 100% Pass. After every working day - AnswerOil and water usually collect in compresed air tanks. If you do not have an automatic tank drain, when should you drain the air tanks? Why drain water from the compressed air tanks? - AnswerWater can freeze in cold weather and cause brake failure. The air brake system for a straight truck or bus should not leak at a rate of more than __________ psi per minute with the engine off and the brakes released....

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9 pages

Written in 2024/2025

Grade A+

Everly

CDL Air Brakes Questions And Answers 100% Pass. Air loss in a straight truck or bus should not be more than how much PSI with the engine off and the brakes on? - Answer3 PSI in one minute To make an emergency stop with air brakes, using the stab braking method, you should - AnswerBrake as hard as you can get off brakes when wheels lock get back on brakes when wheels start rolling again All vehicles with air brakes must have what signal? - AnswerLow air pressure warning signal It is acce...

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7 pages

Written in 2024/2025

Grade A+

Everly