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Cat Man
Cat Man, Cat Engine Expert
Category: Medium and Heavy Trucks
Satisfied Customers: 8413
Experience:  I am ASE Master Truck Certified.
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What would cause air pressure not to build up in my 97

Customer Question

what would cause air pressure not to build up in my 97 Kenworth w900L 3406E 475Cat
Submitted: 1 year ago.
Category: Medium and Heavy Trucks
Expert:  Cat Man replied 1 year ago.
Hi. Thanks for asking your question! I will try and help you out.
There are two things I have seen cause air not to build up.
The first and most common is a failed air compressor governor.
Second is a faulty air compressor.
I would try replacing the governor on the air compressor first. If the problem continues. I would next replace the air compressor.
Please reply back if you need more help or have more questions. I am happy to assist.