The Stovebolt Site Forums The Parking Lot Big Bolts AIR BRAKE PROBLEM

If you haven't found the problem yet a good way to look for the leak would be to hook up your shop air compressor to the truck with the trailer brake valve on (so the air leaks). Without the truck running you should be able to find where the air is leaking out easily as you can hear it a lot better. You can't fix it until you know what is leaking or from where. It could be as simple as a broken air line.

Tad