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Thread: Brake Not Bleeding off Pressure

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    Sergeant WhoMe08721's Avatar
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    Default Brake Not Bleeding off Pressure

    Hey Guys,

    Went out today with one of my m35a2 and the brakes got supper hot about 400F. Hub where cold as ice and the air Temp is about 35F today, there snow on the ground. Just did bakes on it last weekend. Brakes are adjusted right when I jack up the truck the wheels spin freely no drag. But now the pedal got really hard to push and when I drain the air tanks pedal is still hard. Jacked the truck up after they got hot and can not spin the tires. But after about a day of sitting the brakes release and tires spin. Could the air pack be holding air pressure and how dose it release air pressure.

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    4 Star General porkysplace's Avatar
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    Yep , air pack most likely needs rebuilding . When you said you did the brakes did you use D.O.T. 5 brake fluid ? If you mixed D.O.T. 5 and D.O.T. 3 that could cause this also as it gels the brake fluid.
    New-Style (Short) Airpack Teardown & Repair with Photos
    Last edited by porkysplace; 02-11-2019 at 19:12.

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    Super Moderator gringeltaube's Avatar
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    Before anything else - read this post...
    Your issue might be as simple as a MC-pushrod adjusted too long!?


    (thanks to ecbarnum for his very detailed explanation)

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    Drained all brake fluid and replaced all bake fluid with MIL SPEC DOT 5 SILICONE BRAKE FLUID

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    Thanks gringeltaube

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    As gringletaub said brake rod too long or a tiny passage in the master cylinder can get clogged and cause this as I’ve seen it many times on cars, atvs and side by sides, it causes the dragging/not releasing brakes and the hard pedal with no free play.

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    4 Star General bigmike's Avatar
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    Exactly what happened to me.
    1971 M35A2
    1965 M105 trailer
    1965 Lubrication trailer converted to an Indian hauler.
    1941 Indian 741 motorcycle
    1965 M543A2
    1985 M1008
    2001 M-Gator
    1940 M16 halftrack
    MVPA # 33222

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    Open the valve just slightly on the service brake glad hand.
    That's the one on the left rear.
    If problem goes away it's the air pack, if not it's the master cylinder.

    Tom
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    You can also open the glad hand on the passenger(or is it driver? I forget!) side of the truck. If there is constant air coming out, the airpack is suspect.

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    Quote Originally Posted by gimpyrobb View Post
    You can also open the glad hand on the passenger(or is it driver? I forget!) side of the truck. If there is constant air coming out, the airpack is suspect.
    Service air should be on the left rear. That's the air that applies the brakes.

    Emergency or Charge air is on the right rear (pass side)
    That's the air that supplies the tanks or system on the trailer and
    Used for Aux. air ie tires, wrench, etc.

    In the DOT world Emergency. glad hand is Red
    Service is Blue.

    That's why I said Left (drivers) Service air from Air Pack.

    I'm sure you have forgot more than I know

    Tom
    "99" Durango
    "99" Dodge 3500 CTD Dually
    "86" Chev M1028A2 Dually
    "84" Chev K 30 6BTA,400 3.73,No-Spin
    "77" Chev K 30 400ci 400,4.56, No-Spin
    "65" Kaiser M35A1 WW
    "54" Willys M38A1
    "52" Dodge M37 WW
    "47" Dodge WDX WW
    My Photo Album http://www.t137.com/cpg/index.php?cat=10010

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