Question

During an air brake pre-trip inspection on a vehicle with one trailer, you should make sure that air loss is not more than:

a) 1 psi per minute
b) 2 psi per minute
c) 3 psi per minute
d) 4 psi per minute

Answer 1

In an air brake pre-trip inspection for a vehicle with one trailer, the maximum allowed air loss rate is 3 psi per minute to ensure the safety and integrity of the air brake system.

Step-by-step explanation:

During an air brake pre-trip inspection on a vehicle with one trailer, you should make sure that air loss is not more than 3 psi per minute when the air pressure is above 90 psi, the brakes are released, and the engine is turned off. This is the maximum allowable rate of air loss according to Federal guidelines for a combination vehicle under typical operating conditions. The air loss rate is a critical safety measure, indicating the integrity of the air brake system; excessive air loss can lead to brake failure.