My Parking Brake Will Not Release
My Ultimate Freedom with a Cummins ISL 400 and Allison transmission will not let me release the parking brake. I push it in to release, and it just pops back out. I have noticed that it has been do...
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100 psi sounds a little low for your max air pressure. should be in the 120 to 130 range. can take 90-100 psi just to compress the parking brake spring. sounds like the governor is bad.
