skydawg Posted August 31, 2022 Share Posted August 31, 2022 Is it normal for my truck to have to build air pressure after sitting for a couple of days? It`s a new-to-me 1961 B61. Thanks. Quote Link to comment https://www.bigmacktrucks.com/topic/70376-air-prssure-loss/ Share on other sites More sharing options...
Quickfarms Posted August 31, 2022 Share Posted August 31, 2022 Quite normal look up COLA air brake test most trucks will loose air, it is only an issue if the compressor can’t keep up. I don’t start chasing the leak until it happens over a very long lunch 1 1 Quote Link to comment https://www.bigmacktrucks.com/topic/70376-air-prssure-loss/#findComment-508058 Share on other sites More sharing options...
Freightrain Posted August 31, 2022 Share Posted August 31, 2022 Yup, if you get through 12 hrs without having to build 120# you are lucky. My .02 is the air wiper switch and shutters are the two main sources of leaks when truck is shut down. You may have other possible leaks but if the truck is pretty sound, the two things I mentioned will cause the quickest leaks. The wiper switch is a single O ring and the shutter is a rubber cup seal. Quote Larry 1959 B61 Liv'n Large...................... Charter member of the "MACK PACK" Link to comment https://www.bigmacktrucks.com/topic/70376-air-prssure-loss/#findComment-508113 Share on other sites More sharing options...
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