cfd511 Posted September 18, 2018 Share Posted September 18, 2018 (edited) Hello all Today while i was hauling fill to a job site i noticed the air pressure gauge hovering around 70 psi and the red parking brake light came on. i pulled over and applied parking brake which allowed the tank to fill up over 110 psi. i released the parking brake and the tank dropped to just above 60 psi and wouldn't raise above that while driving. I limped home and now im wondering where to start. It seems the leak only happen when the parking brake is released. any ideas where to start? 2000 mack rd dump truck Edited September 18, 2018 by cfd511 Quote Link to comment https://www.bigmacktrucks.com/topic/54313-air-leak/ Share on other sites More sharing options...
terry Posted September 18, 2018 Share Posted September 18, 2018 2 hours ago, cfd511 said: Hello all Today while i was hauling fill to a job site i noticed the air pressure gauge hovering around 70 psi and the red parking brake light came on. i pulled over and applied parking brake which allowed the tank to fill up over 110 psi. i released the parking brake and the tank dropped to just above 60 psi and wouldn't raise above that while driving. I limped home and now im wondering where to start. It seems the leak only happen when the parking brake is released. any ideas where to start? 2000 mack rd dump truck raise box up, chock wheels so no roll, shut engine off and walk around truck, very possible the parking side of a brake can. Will only leak when brakes are released. terry Quote Link to comment https://www.bigmacktrucks.com/topic/54313-air-leak/#findComment-406228 Share on other sites More sharing options...
cfd511 Posted September 21, 2018 Author Share Posted September 21, 2018 Thanks terry , finally found it . its was the tee fitting that supply's the two front most rear axel. the fitting was corroded . 1 Quote Link to comment https://www.bigmacktrucks.com/topic/54313-air-leak/#findComment-406403 Share on other sites More sharing options...
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