CDL Air Brake Practice Test | Questions with 100% Correct Answers| 2024/2025 Verified

The parking or emergency brake on a heavy vehicle can only be held in position by something that cannot leak away, like: a. Fluid pressure b. Spring pressure c. Air pressure d. Any of the above - b. Spring pressure 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 brake released. a. 1 b. 2 c. 3 d. 4 - c. 3 Your vehicle has dual air brake system. If low air pressure warning comes on for the secondary system or for one system, you should: a. Bring the vehicle to a safe stop and continue only when the system is fixed. b. Reduce your speed, and test the remaining system while under-way. c. Reduce your speed, and drive to the nearest garage for repairs. d. Continue at normal speed if only the secondary system fails. - a. Bring the vehicle to a safe stop and continue only when the system is fixed.