Have an 86' 379. The rear brakes are not working. Front brakes and trailer brakes work normally. When hooked to trailer, all parking brakes off, when depressing foot pedal there is air leaking out of a valve mounted under cab near sleeper. Doesn't leak if not hooked to trailer, but rear brakes still don't function. Any ideas?
older 379 brake issue
Discussion in 'Peterbilt Forum' started by casemanwcoh, Sep 26, 2016.
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