20 Tests

Air Brakes Endorsement Test Online | Alabama 2021

Train for FREE online with our Alabama CDL air brake test. The official exam test consists of several obligatory parts, with all of them checking your knowledge of different blocks of road rules. If you need to obtain a AL Class A/Class B driver license in 2021, practice as much as.. Read More

Train for FREE online with our Alabama CDL air brake test. The official exam test consists of several obligatory parts, with all of them checking your knowledge of different blocks of road rules. If you need to obtain a AL Class A/Class B driver license in 2021, practice as much as possible. Free sample tests published on our website will help you check and improve your knowledge and boost your grades. Please bear in mind that the requirements for CDL may vary from state to state.

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1 . During a static leakage test, the maximum leakage rate for a triple combination vehicle with air brakes is ____ in a minute.

9 psi When performing a static leakage test on a triple combination vehicle with air brakes, the leakage rate should be no more than 5 psi in one minute. If air leaks from the air brake system at a quicker rate, the vehicle should not be driven because something likely needs to be repaired.

2 . Brakes can get out of adjustment quickly, especially:

Brakes are particularly prone to getting out of adjustment if they are hot. Be sure to routinely check the adjustment of your brakes. For a vehicle to be safely controlled, all brakes must be properly functioning and adjusted.

3 . All air tanks must include:

A warning sticker. Air brake system tanks must contain drain valves. These valves are used to drain accumulated oil and water from the tanks and may be either manually or automatically operated.

4 . The ____ tells a driver how much pressure is in the air tanks.

Drum brake A vehicle that is equipped with air brakes must also be equipped with a supply pressure gauge. This gauge tells the driver how much air pressure is in each of the vehicle's air tanks.

5 . The air compressor governor controls:

The speed of the vehicle. In an air brake system, the air compressor governor controls when the air compressor pumps air into the air storage tanks.

6 . What should happen before the air pressure in an air brake system tank falls below 55 psi?

The low air pressure warning signal must activate before the air supply pressure drops below 55 psi in the air tank. If the warning signal does not turn on when being tested during an inspection, the vehicle is not safe to drive.

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