my 1999 fld112 single axle started leaking air from out of the relay/proportioning valve exhaust when the brakes are released(yellow button pushed in). i replaced the old one with a new unit as well as the 2 rear brake boosters and there was no change still leaking air. once the brake pedal is pressed or the yellow button out the air stops leaking. if i were to take my hand and block off the exhaust of valve the rear brakes apply and if i moved my had away it will release the brakes as if i were to release the brake pedal. this truck as bin putting a number on me for months now trying to figure out what cud be the problem.
air brake issue
Discussion in 'Trucks [ Eighteen Wheelers ]' started by truckerbangin, Jun 11, 2014.
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