You might consider breaking the output line from the compressor and fitting it with a coupling to connect it temporarily to a shop compressor or air tank,just to see if the brakes will function. If that's a go,it might be a good idea to incorporate the air hose coupling into the system for such emergencies in the future. (Not to mention it'll be useful for filling a low tire or blowing all the dirt out of the cab a couple of times a year.)
Speed
