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Southern Alberta Canada | That can be a bugger, chances are your treadle valve is good, it might be back feeding from another valve in the system. You have relay valves that the treadle valve operates, it's possible one of them is leaking, that may have been the problem to start with. One way to check is when it is happening remove the pilot line from the relay valve over the rear axles and see if air comes out of the pilot fitting and the treadle valve stops leaking.
R14 relay valve for truck/tractor in this picture http://home1.gte.net/res0f98n/airbrake.jpg
Or the R12 valve in this image http://ww2.justanswer.com/uploads/JANECZFJ/2012-02-12_212701_2-12-2...
How old is your truck?
Edited by Offroadnt 7/14/2014 08:07
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Semi Air Brake Pedal Valve problem
