cdl practice test

Air Brake CDL Practice Test


Question #1 of 45

How can you check that the spring brakes will come on automatically?


Step on and off the brake pedal to reduce the air tank pressure. The parking brake knob should pop out when the air pressure falls to the manufacturers specification.

Step on and off the brake pedal to increase the air tank pressure. The parking brake knob should pop out when the air pressure rises to the manufacturer's specification.

Step on and off the brake pedal to reduce the air tank pressure while moving at a high rate of speed. The parking brake knob should pop out when the air pressure falls to the manufacturer's specification locking up all your tires.

Step on and off the brake pedal to reduce the air tank pressure. The parking brake knob should pop out when the air pressure rises to the manufacturer's specification of 120 psi.





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