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...
Forum Discussion
rcmiller32 wrote:
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.
I should have said it goes OVER 100 psi. I will look and see how much over and try to adjust if necessary.
I did have a repair done on my air system a couple of months ago. Maybe they messed up the max pressure setting.
