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Key switch / air bag belt tensioner
I am now having a unusual problem . When I turn off my key switch the air in my belt tensioners will lose air in about 15 mins . when I turn the key back on the air bags will inflate ( as long as I have air in the main tanks ) . I would like to add I have been driving in some heavy rain the last few times I have been out …
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1 Reply
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The belt tensioner system has to have a check valve to prevent air in the small bellows from leaking back into the bus system. But having said that based on your comment that the system re-pressurizes when you turn the key back on suggests that is not likely the problem.
The air into the system goes through a pressure regulator which has to control the pressure to XX PSI. I cannot remember the exact pressure. It also goes through a valve that when open inflates the bellows, but when closed exhausts the air in the bellows system. Both the regulator and valve have a tendency to leak.
But with the various fittings and the small bellows there are multiple potential leak points. Soapy water will help you identify where you are losing pressure.
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