jeffl1107 Posted May 19, 2010 Share Posted May 19, 2010 Hey all. I just bought a 1997 Mack RD688 tri axle dump truck. Been fixing some things on it and not being familiar where stuff is on this, have a question. The truck is, I am sure, building up to much pressure in the air system. The guage in the truck goes up to 150 psi. I have had it just past the 150, probably up to 160 and I hear not bleed off of the air to keep it from building up to much. Can someone help me with finding the bleed off valve because I would assume it needs replacing. I know on a Ford truck I had, that bleeder valve use to pop at around 130psi. Quote Link to comment Share on other sites More sharing options...
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