ws721 Posted March 8, 2014 Share Posted March 8, 2014 Still trying to figure out my brake problem. Brakes sometimes don't release when you take your foot off the pedal. If I use trolley brake they ALWAYS stay on. When they stay on it takes about a minute for the air to release unless I un hook the service line to trailer. I have replaced the tractor protection valve as well as the treddle valve. doesn't matter what trailer im pulling. There are 2 junction blocks for air in the dash. Does the treddle valve feed thru the trolley or does the trolley valve feed thru the treddle valve? Quote Remember if it's got a hood it's no good! Link to comment https://www.bigmacktrucks.com/topic/34964-mh-schematic/ Share on other sites More sharing options...
ws721 Posted March 10, 2014 Author Share Posted March 10, 2014 This seems like a dumb question, AT least to me it does. While trying to figure out my brake issue I discovered that the exhaust line form the trolley valve was plugged. Now the trolley brake works fine. Havent been down the road yet but in the yard so far the brakes have not hung up. Is it possible that the plugged exhaust line was my trouble all along? Do the foot brakes exhaust thru the trolley exhaust line? Quote Remember if it's got a hood it's no good! Link to comment https://www.bigmacktrucks.com/topic/34964-mh-schematic/#findComment-236674 Share on other sites More sharing options...
j hancock Posted March 10, 2014 Share Posted March 10, 2014 Could have been the problem. There is a vent in the bottom of the treadle valve. If spring ever shows up, a trip around the block may give some answers. Quote JimIt doesn't cost anything to pay attention. Link to comment https://www.bigmacktrucks.com/topic/34964-mh-schematic/#findComment-236699 Share on other sites More sharing options...
ws721 Posted March 10, 2014 Author Share Posted March 10, 2014 I hope the problem is cured. Find out Tuesday as were headed for Colebrook. The treadle valve is new too. Thanks Quote Remember if it's got a hood it's no good! Link to comment https://www.bigmacktrucks.com/topic/34964-mh-schematic/#findComment-236716 Share on other sites More sharing options...
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