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CDL Air Brakes Endorsement Practice Test -4

Study for your CDL Air Brake Test with this FREE Practice Test. 25 practice Questions for CDL Air Brake Test straight from the CDL hand book, Stop stressing about the test and practice today with our multiple choice practice test.
Questions number
Mistakes Allowed
Passing Score


A typical low air pressure warning signal is what color?
  • Red.
  • Yellow.
  • Blue.
  • Green.
  • Purple
Automatic front wheel limiting valves ________.
  • Always reduce the air to the rear brakes.
  • Cannot be controlled by the driver.
  • Increase the chance of the front wheels skidding on slippery surfaces.
  • All of the listed answers.
Avoid using the parking brakes when ________.
  • The air pressure is low.
  • You are parking.
  • The brakes are very hot.
  • Parking on steep hills.
Combination vehicles should not leak at a rate of more than ______ psi per minute with the engine off and the parking brake released.
  • 3
  • 1
  • 2
  • 7
If the air compressor has its own oil supply you should do what before driving?
  • Check the oil level.
  • You don't need to do anything if it has its own oil supply.
  • Empty the air storage tank.
  • None of the listed answers.