Mikesbucketlistmack Posted October 11, 2012 Share Posted October 11, 2012 I went to look at a used 1976 single axle R 686T dump that was for sale. After building up the air pressure, I went and released the blue and yellow knobs, and all the air dumped out. The owner insisted that nothing was wrong, and that I only have to push in the yellow knob to release the brakes. He did this and tried to move the truck, but I could hear the brakes squealing as they held the truck back while this guy revved the piss out of the engine to get it to move. Am I wrong, or is there something wrong with this truck ? I really did like it for the price, but was wondering if this is an expensive problem to fix. Quote Link to comment https://www.bigmacktrucks.com/topic/27768-air-brake-system-problems/ Share on other sites More sharing options...
David Posted October 12, 2012 Share Posted October 12, 2012 If there was a red knob (trailer) and it was also pushed or stuck in, all the air would be dumped out the red glad hand. Also a leak in a hose or diaphragm on a maxi will loose all your air. Push the knobs in and find the air leak. Quote Link to comment https://www.bigmacktrucks.com/topic/27768-air-brake-system-problems/#findComment-141338 Share on other sites More sharing options...
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