Question:
Step 1 of the CDL air brake tests makes sure the leak rate of the red and blue line is not unsafe. With the parking brake released and the brake pedal applied, the leak rate should be no more than _________.
A
3 PSI for a vehicle with no trailer, and 4 PSI for a combination vehicle in one minute.
explanation
The air leak rate should be no more than 2 PSI for the red line, 1 PSI for the blue line. In a non-combination vehicle, that is 3. For a combination vehicle, you will need to add 1 PSI for the trailer bringing the total to 4.
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