Posted by NCWayne on October 28, 2011 at 22:31:26 from (69.40.232.132):
In Reply to: Air brake question posted by Moline_guy on October 28, 2011 at 21:22:21:
Depending on the exact plumbing on your truck there are a couple of things that could be wrong. I know there is typically some sort of 'protection' valve that seperates the primary and secondary side in case of a line rupture, etc. What type your system uses, where it is, etc I can't say for sure but it sounds to me like the valve has shifted and is allowing only the secondary side to be used.
Often these valves are designed as shuttle valves that allow air to get by to keep the secondary chamber charged and it shifts to act as a check valve to block the primary side when it senses a drop in pressure on that side of the valve. The restriction caused by it being stuck in it's shifted position would explain the air being applied from the secondary side only, along with what I gather you were talking about it taking 'a little bit' ((((I read that as longer than it should))) for the secondary side to come back to full pressure.
Here is a link to a Bendix air brake manual that will show you pretty much all you need to know about air brake systems, how they work, and how all the various valve types are used.
I know there is alot more to these systems than I have talked about here. Unfortunately there also many different system designs so a bare bones, generic, idea of the problem is the best I can do here. I just hope this helps you some. Good luck. Wayne
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