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It is leaking out of the vent during normal driving then a lot more when pressing on the brake pedal. I will check the brake application valve. No leaks when the parking brake is applied. Thanks.

Everything was fine, went over a speed bump and then the next time I applied brakes, I heard the air. Later inspection found that it does not leak when the parking brake is applied, but does leaks slowly while driving but lot more when the brake is applied. The gauge is running 90-100 psi while...

When driving air began leaking from a fitting above and behind the grill. All similar fittings have lines attached. As you see from the photo there is nothing there. I'm wondering if some sort of pressure valve should be there and fell off or is there something inside that needs servicing. Any...