Air Brakes #1
Air Brakes Endorsement Test | Arkansas 2024 #1 Page 4 of 4
Train for FREE online with our Arkansas 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 AR Class A/Class B driver license in 2024, 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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19 . When you press the brake pedal in a vehicle with S-cam brakes, air pressure pushes out the rod and moves the:
Alcohol evaporator.
When pressing the brake pedal in a vehicle with S-cam brakes, air will enter the brake chambers. The added air pressure will push out the rods and move slack adjusters, twisting the brake camshafts.
20 . Air brakes use ____ to function.
The brakes in an air brake system use compressed air to function properly.
21 . Vehicles with dual air brake systems:
Maintain air pressure when shut off for periods of less than four hours.
Before driving a vehicle with a dual air brake system, allow time for the air compressor to build up pressure of at least 100 psi in both the primary and secondary systems.
22 . Brakes may get out of adjustment:
If they get wet.
Brakes can get out of adjustment quickly, especially if they are used to the point of overheating. Brake adjustment should be checked frequently.
23 . Emergency brakes:
All trucks, truck tractors, and buses must be equipped with emergency brakes and parking brakes.
24 . Brake fade is a result of:
If brakes are overused, they can become too hot. This overheating causes them to fade, making them less effective at slowing the vehicle.
25 . If using air tanks with manually operated drains, how often should you drain the tanks?
Once every six months
