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Recent content by AmbitionStrikes

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    M1078 Drives Through Brakes

    @Coffey1 Now you got me thinking. From studying the schematic I can see that the purpose of the check valve you are referring to is to prevent air from feeding back through the front service glad handle to the pedal valve. So, if that check valve were stuck it could easily prevent air from...
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    M1078 Drives Through Brakes

    I guess when I said "get the front brakes to do more" I really meant "make the rear brakes do less so the front brakes have a chance to get up to adequate pressure before the rears lock up" Thanks for the info. I have watched the Neilvvt brake video. Doesn't look too bad, part of me wants to...
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    M1078 Drives Through Brakes

    Embarrassingly, I don't own a set of feeler gauges. However, I couldn't slip a piece of .030 welding wire between the shoes and the drums at the little scallop in the center of the arch. So it seems like they are in adjustment. Out of frustration I decided to try and take the truck for a drive...
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    M1078 Drives Through Brakes

    Thank you so much for this detailed post. We hooked up shop air of 100 psi to the front emergency glad handle. Pressure at the output of the rear relay valve was 80psi. Unhooked the LSPV arm to simulate a load and then got 100psi. Started the truck and let it get up to pressure (waited for the...
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    M1078 Drives Through Brakes

    We paid to have a heavy wrecker tow the truck back to our house. Now it's going to be significantly easier to work on and diagnose. I bought fittings to hook shop air up to the front emergency glad handle today and a pressure gauge and fittings to test the pressure in the various lines. I will...
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    M1078 Drives Through Brakes

    Thank you very much for the detailed reply and the diagram.
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    M1078 Drives Through Brakes

    I'll add that to the list of things to check today. The truck is parked at the previous owners home an hour away.
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    M1078 Drives Through Brakes

    The truck was driven regularly by the previous owner until parked 4 years ago and the brakes worked fine. They haven't touched it since parking it. Although what your saying does make me start thinking about stuck check valves. Is there a good diagram or schematic showing all of the air plumbing?
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    M1078 Drives Through Brakes

    Wouldn't this manifest as a leak? We can't detect any leaks. Another piece of info: If the park brake is set (air released) and I step on the service brakes with the truck in gear it will start moving until I release the service brakes.
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    M1078 Drives Through Brakes

    The truck: 1994 m1078 Condition: Has sat for several years, owner said the last time he drove it the brakes worked fine. Located in CA, temps are well above freezing. Issue: When in gear the truck drives through the brakes, even at idle. If you engage the parking brake, it locks up and...
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