How to Troubleshoot Air Brakes

Air brakes have become a more common sight in the automotive world, with some high-end automobiles even carrying them. Yet, often, air brakes on cars can be showy overkill. It is a system that is more vital and more common on large trucks, playing a key part in the stopping process. With that in mind, it is vital to troubleshoot any problems that may occur, from clogged valves to leaking air pressure.

Instructions

1

Visually inspect the air brake in your vehicle for structural soundness. At the same time, listen for any unusual sounds, like hissing, that could indicate a problem with the lines.

2

Start your vehicle and look at the air gauge. This vital instrument should show the air pressure build to 120 psi (pressure per square inch) and hold steady if the compressor is working properly. If not, have a mechanic look at your compressor.

3

Drain the air tanks in order to clean out any debris or contaminated fuel that may be affecting the air brake's operation. Turn the hand valves located at the bottom of both air tanks counterclockwise to open them. You will see a mixture of water and oil drain from the valves. Wait until no more sludge is coming from the tanks before closing the tanks by turning the valves clockwise.

4

Push in the brake-releasing valve while keeping an eye on the air pressure gauge for any drop in pressure from the optimum reading of 100 psi. If this drop does occur, then one or more of the brake chambers are leaking air and should be replaced.