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that is a problem with your relay valve not a park brake issue sounds like the shuttle piston is sticky. it could be water in your system freezing also a common issue with prolonged use of alcohol

I prefer to refrain from alcohol unless it is an emergency. alcohol is a solvent and corrosive it will remove lube in your relay valves and cause corrosion.

petroleum products not only are flammable but will adversely affect the friction surface causing the wheel to lock up, that's why shoes are replaced when oil soaked. I had morons in the sand box telling me to remove all thermostats in vehicles under my control too. I argued the point got...

avoid petroleum products on brake friction surfaces. The shoes have rusted to the drums, this is pretty common, block the wheels so it cant roll, build air pressure release the brakes, and beat on the drums a couple of times with a bfh you will see the shoes pop loose set the brakes remove your...