Posted by JD Seller on October 02, 2016 at 08:02:14 from (208.126.198.123):
In Reply to: Air brake question posted by notjustair on October 02, 2016 at 07:53:24:
IS it the re-dryer dumping off air??? Is the air pressure at the high side kick out pressure??? IF it is and the air is coming from the re-dryer then the air governor is bad. That is the small control valve assembly on the back of the air compressor. They are held on with two bolts. Pretty easy to change.
If it is the pressure dump valve on the air tanks it still is the air compressor governor not shutting the compressor off and it is over pressuring the system.
Here is a picture of the most common air governor on your era of truck. They can be mounted in several ways so that is why there are several plugs included with the new ones. They usually cost around $25-30. The black cover screws off. Under it is a screw with a lock nut. This is how you set the kick off pressure. IT is backwards from a normal pressure valve. Meaning screwing the screw out raises the pressure. In is lower and out is higher. Most trucks kick out at 115-120 PSI
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