Question

With a fully-charged air system with the engine off, parking brakes released and service brakes off, a combination vehicle should lose no more than ––- psi in 60 seconds.

1) 1 psi
2) 2 psi
3) 3 psi
4) 4 psi

Answer 1

A fully-charged air system in a combination vehicle should lose no more than 3 psi in 60 seconds when tested with the engine off, parking brakes released, and service brakes off.

Step-by-step explanation:

In the context of a combination vehicle's air brake system, a fully-charged system with the engine off, parking brakes released, and service brakes off should lose no more than 3 psi in 60 seconds. This is a requirement for maintaining safety standards and ensuring that the air brake system is functioning properly and retaining air pressure efficiently.

If the air loss exceeds this amount, it might indicate a leak or issue in the air brake system that needs to be addressed to prevent failures that could lead to unsafe driving conditions.

In a fully-charged air system with the engine off, parking brakes released, and service brakes off, a combination vehicle should lose no more than 2 psi in 60 seconds. A fully-charged air system in a combination vehicle should lose no more than 3 psi in 60 seconds when tested with the engine off, parking brakes released, and service brakes off.