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Thread: M939 Front Brake adjustment?

  1. #11
    I'm the dude, man. Steel Soldiers Vendor simp5782's Avatar
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    Quote Originally Posted by 00t444e View Post
    I rigged up a fitting so I could apply air to the actuator, and the wedge and shoes moved freely when I applied air. I believe that means I have an air supply issue.
    Or a bad q2 valve if its dumping air out the stack
    2008 F-250 6.4L Powerstroke
    1984 AM General M923A1 ( Big Cam III NTC-400, HT3B turbo, Intercooled, #15 button, Dual fuel Line setup - MRAP Aluminum Radiator - 8" Ram Air Intake system - Dual 115 gallon tanks - Air Conditioning - 145amp alternator - Puradyn Oil Bypass system, CAT 7155 16speed transmission, Oshkosh 55000 Transfer Case, riding on 16.00 AT-3s on HEMTT wheels. )
    83' M923A1
    M796 Bolster
    M322 Equipment Trailer
    MEP-804A


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  3. #12
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    I put a pressure gauge on the supply line for the brakes and got no pressure at all when the pedal is pushed.

  4. #13
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    Pull the middle line off of the q2 valve in front of the front axle and see if you have pressure at that supply line when it is depressed
    2008 F-250 6.4L Powerstroke
    1984 AM General M923A1 ( Big Cam III NTC-400, HT3B turbo, Intercooled, #15 button, Dual fuel Line setup - MRAP Aluminum Radiator - 8" Ram Air Intake system - Dual 115 gallon tanks - Air Conditioning - 145amp alternator - Puradyn Oil Bypass system, CAT 7155 16speed transmission, Oshkosh 55000 Transfer Case, riding on 16.00 AT-3s on HEMTT wheels. )
    83' M923A1
    M796 Bolster
    M322 Equipment Trailer
    MEP-804A


    901-318-8353 for Help in and or around the Memphis area or transporting in the southeast. Text me first before calling.

    Tires (HMMWV, 395s, 1600s) and Transportation Vendor

    Wes

    Videos at https://www.youtube.com/results?search_query=5782simp

    https://www.youtube.com/channel/UCTd...D4dOJidPFnmYGA

  5. #14
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    Quote Originally Posted by simp5782 View Post
    Pull the middle line off of the q2 valve in front of the front axle and see if you have pressure at that supply line when it is depressed
    I pulled the line off and it has pressure going to it when the brake is pushed, but nothing is coming out to the wheels.

  6. #15
    I'm the dude, man. Steel Soldiers Vendor simp5782's Avatar
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    Bad Q2 valve. O'Reillys # 229505CX or napa 229505x
    2008 F-250 6.4L Powerstroke
    1984 AM General M923A1 ( Big Cam III NTC-400, HT3B turbo, Intercooled, #15 button, Dual fuel Line setup - MRAP Aluminum Radiator - 8" Ram Air Intake system - Dual 115 gallon tanks - Air Conditioning - 145amp alternator - Puradyn Oil Bypass system, CAT 7155 16speed transmission, Oshkosh 55000 Transfer Case, riding on 16.00 AT-3s on HEMTT wheels. )
    83' M923A1
    M796 Bolster
    M322 Equipment Trailer
    MEP-804A


    901-318-8353 for Help in and or around the Memphis area or transporting in the southeast. Text me first before calling.

    Tires (HMMWV, 395s, 1600s) and Transportation Vendor

    Wes

    Videos at https://www.youtube.com/results?search_query=5782simp

    https://www.youtube.com/channel/UCTd...D4dOJidPFnmYGA

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