01 classic, It all started with the air dry purge valve doesn't shut close rite away. it will keep purging air until i hit the brake or it reaches 110 psi. i replaced the entire air dryer sinse it was original to the truck. didn't fix the problem. went looking around and found there was a slit leak at the treddle valve. so i replaced it. valve still leaks and dryer still the same. was having a little trouble with the mv3 valve sticking so i rebuilt that. no change. cant hear any leaks anywhere else. is the a valve in the system that might not be closing, causing air to flow bake threw to the treddle valve?
treddle valve leak, air dryer has long purge
Discussion in 'Freightliner Forum' started by JAYRODPA, Jun 15, 2014.
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foot brake valve leaking,
1)put park brake on .
2) do you still hear the leak?
if no - replace trailer control valve.
to make sure its trailer control valve , deactivate park brake . remove pipe from port number 42 and 41 on the trailer control valve . if air is coming fromeither one of these ports the valve is damaged. replace it.
the foot peddle will now not leak anymore.
PS: to find the trailer control valve , follow the suzy pipes going to the trailer back into the ruck. the first big air valve you find should be in most cases be the "trailer control valve"
if this doesn't solve the problem
also remove the pipe from the loadsensing valve port number 4 check if air is coming from load sensing valve (port 4) if so, replace it .
hope this helpLast edited: Jun 26, 2014
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