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SouthCentral WI | The simplest way to check it, is to tee an air pressure gauge into the service line of the chamber. When stepping on the brake pedal, presure should crack at 4 to 8 psi and increase slowly as you push on the pedal more. If this happens (correctly) then your issue is in the mechanical operation of the brakes. If the valve cracks and goes to 20 psi or higher then tee into the control line of the relay valve above the axle. This should have a slow increase of pressure as you push harder on the brake (treadle) valve.
I'd doubt you have a BR-R1 valve. They aren't that common. You can tell because it will have an extra line to it. It takes the place of the r12 valve, but requires a bit more plumbing.
My guess is a bad relay service valve (probably an r12)
Towmman
Edited by towman2000 1/28/2018 21:31
 (Bendix Air System.jpg)
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 Bendix Air System.jpg (61KB - 357 downloads)
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Peterbilt brake issue
