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maxi brakes

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gday guys will here


1998 mack trident, i have full air and push my yellow button in and it leakes out of the exhaust part of the rear valve that services the rear boosters. i push the brake peddle in and the leak goes away and air builds up to normal again. 


i have pulled the service linesof each booster and no air is coming out when maxis are released so boosters are good.


any idea where i should start looking now?



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