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When Hot, my brakes have to be pushed almost all the way down to slow down. When Cold they work fine 700

posted by  jamesp on  Thu Jun 9 01:28 CST 2005
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I have a 1989 760 turbo.

I had the front Rotors replaced not too long ago. THe rear ones are due and I think one of them is warped to begin with because when I slow down with them cold, I can tell there is a warped on off feel when applying the brakes.

Now when the brakes are hot on tthe highway, I really have to push down hard to stop the car. When I push on the brake, I feel a resistance point but my foot passes through it and does not slow, to the point where I have to push harder. Kind of a spongy feel that I pass through at the first resistance point..where one would normally expect the brakes to enguage (which they do when the brakes are cold i.e in slow rural driving)

Any suggestions?

Thanks!








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    When Hot, my brakes have to be pushed almost all the way down to slow down. When Cold they work fine 700

    posted by  walrus3 on  Thu Jun 9 04:34 CST 2005
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    last visit: Mon Dec 2 14:20 CST 2013
    [RELATED]

    I'm not sure about the 700s but on the 140/164 this would be a symptom of a
    dragging brake, probably caused by a brake line swollen shut. One way to tell
    is to drive around and then feel the brake disks with caution. If one or more
    is VERY hot the brake is dragging. To tell if the line is stopped up open the
    bleeder valves a bit. If they drip they are OK. If not, suspicion sets in....
    --
    George Downs Bartlesville, Heart of the USA!








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    When Hot, my brakes have to be pushed almost all the way down to slow down. When Cold they work fine 700

    posted by  fixit2003 on  Thu Jun 9 03:25 CST 2005
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    Check how much pad you have left. If they're almost worn out it would affect you brake operation. You could also have some stuck calipers. The guide pins would need to be pressed out and relubricated or the calibrators replaced.








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    When Hot, my brakes have to be pushed almost all the way down to slow down. When Cold they work fine 700

    posted by  david hunter on  Thu Jun 9 03:18 CST 2005
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    last visit: Mon Jun 30 22:10 CST 2014
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    Brakes should get hot on the highway, if anything they should be cooler because you are not using them as opposed to stop and go city. Brakes will heat up under extreme and repeated use and cause fade which is more like what you describe. Sticking caliper slides or pistons can also cause heating up and fade.

    Although flushing is good preventive practice to stop corrosion I doubt it is causing your symptom.--
    David Hunter








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    When Hot, my brakes have to be pushed almost all the way down to slow down. When Cold they work fine 700

    posted by  eadlermn on  Thu Jun 9 02:58 CST 2005
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    last visit: Tue Dec 7 11:59 CST 2010
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    How long since the brake fluid has been replaced? Sounds like there might be water in the line that turns to steam as the fluid gets hot.

    Good luck!

    -Eric
    '89 765t, 196k
    '93 944t, 126k








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      When Hot, my brakes have to be pushed almost all the way down to slow down. When Cold they work fine 700

      posted by  jamesp on  Thu Jun 9 06:20 CST 2005
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      I replaced it about a year and a half ago.

      Another thing...On occasion when driving and not applying the brake, I hear squaking on the front right at slow speeds. Sounds like that may be the issue? It only happens sometimes.








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        When Hot, my brakes have to be pushed almost all the way down to slow down. When Cold they work fine 700

        posted by  B.C. on  Thu Jun 9 21:09 CST 2005
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        last visit: Wed Mar 28 22:28 CST 2012
        [RELATED]

        Take the advice about water in the fluid and a dragging caliper.

        Dragging caliper can make enough heat to boil any water in the fluid in that area, or maybe even boil the fluid. BTDT. Either way you get a gas in the lines, which is compressable and thus lowers braking efficiency a lot. Stepping of the pedal merely compresses the gas, not much motion of the pads.

        After coming to a stop where you can exit the car, hold a bare hand near the RF and LF wheel, DO NOT TOUCH. Test for unequal amounts of heat.

        Check out the hotter caliper.

        Good Luck,

        Bob

        :>)







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