Free Combination Vehicles Test - CDL Questions and Answers
free combination vehicles test
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Combination Vehicles Test

Question #1 of 34

Charge the trailer air brake system and push the air supply knob in. Shut the engine off. Step on and off the brake pedal several times to reduce the air pressure in the tanks. The trailer air supply control should pop out when the air pressure falls into the pressure range specified by the manufacturer.


This is how can you test the tractor protection valve.

This is how can you test the trailer emergency brakes.

This is how can you test that air flows to all trailers.

This is how can you test the trailer service brakes.

This is how you test the air pressure gauge.

None of the above.








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