Question

To test the air leakage rate, one must turn off the engine (with a fully charged air system), turn the key to the "on" position, release the service brake, and `____`.

Accepted Answer

time the air pressure drop

Answer

measure the PSI as the air pressure gauge falls from its original amount

Answer

measure the amount of pressure in the system, then come back in about 30 minutes and measure the pressure again

Answer

time how long it takes for the air compressor governor to cut-in

Question 39 - Air Brakes Test Practice Test for the CDL