Re: Big truck parking brakes

Posted by RodInNS on August 11, 2007 at 07:33:09 from (24.224.246.156):

In Reply to: Big truck parking brakes posted by Roy Suomi on August 10, 2007 at 20:22:45:

I think Wayne cover about everything. I hadn't heard of using feeler gauges on the shoes, but I don't take these courses either....
I can say for certain that the old style adjustment of run it tight and back off a 1/4-1/2 turn doesn't work all that well on Rockwell automatics... I basically ran them up as tight as I dared, and went for a drive. Find the hot ones and back them off a hair... That's not a precise method by any means, but it got them working better. Haven't smoked any red lights lately anyway.

As far as Maxi's taking 90 PSI to release.... I never heard of that. Maxi's start to release at 45 psi and are fully released at 60 psi. As far as I know that's pretty much an industry standard. The service chamber can develop nearly twice that force...

Rod

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