609albert Posted December 17, 2015 Share Posted December 17, 2015 I have what sounds like air leak at air brake pedal on a '71 CF Mack is it normal? Quote Link to comment https://www.bigmacktrucks.com/topic/43154-air-leak-at-brake-pedel/ Share on other sites More sharing options...
gearhead204 Posted December 17, 2015 Share Posted December 17, 2015 albert, I will say no! is it coming from the top of the valve or the bottom of the valve? does it make any difference if the "park" brake is applied or released, given the vintage of the truck the O-rings may have failed in the treddle valve, but other issues can cause this as well, need more info. Quote Link to comment https://www.bigmacktrucks.com/topic/43154-air-leak-at-brake-pedel/#findComment-316199 Share on other sites More sharing options...
609albert Posted December 18, 2015 Author Share Posted December 18, 2015 I will look into farther and post results, would you replace or rebuild the tredel ,looks like an awarkward position to work on. Quote Link to comment https://www.bigmacktrucks.com/topic/43154-air-leak-at-brake-pedel/#findComment-316251 Share on other sites More sharing options...
gearhead204 Posted December 19, 2015 Share Posted December 19, 2015 you will expand your 4 letter vocabulary when you change out that valve for sure as I have always been told and believe ,the most important thing on a truck is its brakes, a truck that cant move don't hurt anyone, but one that don't stop can KILL! Quote Link to comment https://www.bigmacktrucks.com/topic/43154-air-leak-at-brake-pedel/#findComment-316340 Share on other sites More sharing options...
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