It is not dumping the control pressure fast enough for some reason ( blue line). The service brake valve-valves should dump air when the pedal is released. Some trucks have a inline dump valve at the back of the cab to help. As others have said tractor protection valve, foot valve etc. Other people talk about stuff a lot newer than I know much about but start with the simple stuff. Dirt around the plunger on top of a foot valve has cost a lot of money.
When I let off brake peddle, trailer brakes still have pressure applied
Discussion in 'Trucks [ Eighteen Wheelers ]' started by BigRod2015, Aug 16, 2016.
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But you did, and I quote
Say that you have a trailer air pressure gauge which just happens to be about normal operating pressure of a primary or secondary air pressure gauge.
You will never have 120-130 brake psi unless you put your foot through the floor. -
After cleaner out filter and replacing return line, it started back doing it again.. I crawled around umfer the truck and could hear a small air leak. I tracked it down to a rust spot on the secondary tank, between the tank and cross member of which there is a man made hole there I put my finger in and could feel the air. So now I have to get a new tank or have this one fixed. Would this small air leak cause such a delay in the air dumping when I let off the brake peddle? Or could I now be looking at two different issues?
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