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Ncbuses
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4 Posts
Posted - 07/09/2018 :  08:59:43 AM  Show Profile  Visit Ncbuses's Homepage  Reply with Quote
We have a 2008 C2 bus that will not release park brake. You can build air, hold foot on service brake, push in on park brake and it releases. But as soon as you take foot off service brake air dumps behind park brake dash valve and park brake light comes back on. This is a non lift bus. We have replaced brake light, double check valve, and park brake AMU's. The park brake hand valve has been replaced. Both rear chambers are good. All AMU's are getting power and ground. Has anyone seen this.

aaronwilmoth80911
Top Member

538 Posts
Posted - 07/10/2018 :  08:54:42 AM  Show Profile  Visit aaronwilmoth80911's Homepage  Reply with Quote
Load test the input wire to the park brake AMU. I had one that had green gremlins in the copper of the wire and it would not allow the AMU to work correctly. Also, double check all your AMUs are working correctly. There is a way to verify that they are all working correctly.
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