Can you tell me exactly what part you replaced? We're having the same problem on our prostar. Took it to the dealer and it was working fine for them so they didn't do anything.
Air pressure not building
Discussion in 'Trucks [ Eighteen Wheelers ]' started by Bigray, Jul 8, 2009.
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Hmm did you check the air dryer my freightliner the spitter on the bottom would stick open and not build any air... D0 you build an air? Both needles on the air gauge down or just one?
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I have the same problem with my Cascadia. Pressure only builds up to 60 on both tanks but it stays there while idling and doesn’t build up anymore unless driving down the highways
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If it build higher pressure with higher engine speed, I would say you have a massive leak somewhere.
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Having low air pressure problems builds only to 65 to 70 lbs. New compressor, new regulator, no air leaks.
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I have a 2016 cummins ISX only building air at idle. replaced the air dryer assembly including governor and still have the same problem. it only builds to about 85 psi but will hold no leaks anywhere. took the line off compressor and its seems to be pumping properly at idle and 1500 rms
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ccrispell Thanks this.
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