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MH schematic


ws721

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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?

Remember if it's got a hood it's no good!

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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?

Remember if it's got a hood it's no good!

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