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Thread: Air wont build up bleeds off thru intake

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    Default Air wont build up bleeds off thru intake

    931-a2 wont build up air pressure can hear air escaping in intake stack wont hardly build 80 lbs shut off and bleeds out thru intake right away.. Help PLEASE
    Last edited by aztec; 08-06-2019 at 11:09.

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    4 Star General 74M35A2's Avatar
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    I think this one is an air brake part, possibly located just behind front bumper. Simp knows this system somewhat decently. He'll be along here in a minute....
    CFO @ Portacharger

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    Thanks

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    I'm the dude, man. Steel Soldiers Vendor simp5782's Avatar
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    First make sure that your transfer case handle switch is not stuck pushed in. This can allow air to bypass the interlock solenoid and vent out. If your problem stops, report back, if nothing changes move on to making sure your brake pedal is releasing all the way back up. If it is fine. With it running, open the drivers rear glad hand and see if you have air escaping that is bypassing the brake pedal valve. If yes, report back and we can chase it. If no pressure is there. Crawl under the truck and close off the valve that Is on top of the wet tank on the truck. It has 2. One on front. One on the top middle. Close the top middle and see if your primary air gauge builds more pressure and the air escaping sound goes away. If no. Report back and we can chase that issue. If the primary builds air pressure Then reopen the secondary shut off valve and go to the front of the truck There is a small drop down plate with 4 or 5 air lines on it in front of the front axle below the radiator. Scrape paint from the lines and remove the white line from the valve. This is usually the bottom drivers side line. If you have air coming from the valve on that port, you have a bad Q2 valve.

    If you have air coming from the line side you removed then that next
    Step is to start at the brake pedal vent and work your way back. Report back after you have followed these diagnostic procedures. I can make a video If needed.
    Last edited by simp5782; 08-06-2019 at 12:07.
    2008 F-250 6.4L Powerstroke
    1984 AM General XM923A4 ( Big Cam III NTC-400, HT4B turbo, Intercooled, #10 button, Dual fuel Line setup - MRAP Aluminum Radiator - 7" 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. )
    M923A1
    M931A2
    M1083
    M1078
    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. The Following 3 Users Say Thank You to simp5782 For This Useful Post:

    jmb6741 (08-13-2019), silverstate55 (08-10-2019), Terracoma (08-06-2019)

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    xfer sw good brake pedal up no air glad hand closed valve on top of tank no change other primary stays at zero secondary wont go above 80 long time air coming out intake

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    352-322-0692

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    I'm the dude, man. Steel Soldiers Vendor simp5782's Avatar
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    Ok so with the secondary valve closed the secondary tank holds air and does not bleed off.

    This indicates a primary side bleed and nothing on the secondary to include the Q2 valve. However we want to make sure so on the front Q2 valve vent line and see if you have air coming from the line side. If yes, move on to the treadle valve vent line. This is the very top air line on the treadle valve in the engine bay to the inside of your Protective control box. Remove the top line and see if you have air pressure from the valve side or the line side. This will be a large Horton jacket hose with 7/8" JIC fittings. Make sure both valves are open on the wet tank first. If air is coming from the valve side. Replace the brake pedal valve if air is on the line side move on to Chock the wheels while parked on flat ground. Release the parking brake. After releasing the brake see if your secondary tank drops air pressure. It shouldn't. Take a spray bottle with soapy water and spray around the spring brake cans on the front axle first. Then work your way to the Right rear. Report back on which one you see bubbles on. IF you have no bubbles at all. Let me know and I can tell you how to isolate which cans it could be. More than likely it is a spring brake diaphragm
    2008 F-250 6.4L Powerstroke
    1984 AM General XM923A4 ( Big Cam III NTC-400, HT4B turbo, Intercooled, #10 button, Dual fuel Line setup - MRAP Aluminum Radiator - 7" 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. )
    M923A1
    M931A2
    M1083
    M1078
    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

  9. The Following User Says Thank You to simp5782 For This Useful Post:

    silverstate55 (08-10-2019)

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    secondary does bleed off wont build past 80

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    constant air leak into intake

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    I'm the dude, man. Steel Soldiers Vendor simp5782's Avatar
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    Ok. If you closed the valve it can't build air pressure so it should be at 0 or holding what it's got and not bleeding off. So zero or holding pressure on the secondary with it closed. The primary Is not building air at all then with the primary valve solely open either.
    2008 F-250 6.4L Powerstroke
    1984 AM General XM923A4 ( Big Cam III NTC-400, HT4B turbo, Intercooled, #10 button, Dual fuel Line setup - MRAP Aluminum Radiator - 7" 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. )
    M923A1
    M931A2
    M1083
    M1078
    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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