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sticking caliper 700

posted by  voice122 on  Mon Apr 18 01:10 CST 2011
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last visit: Mon Oct 20 00:08 CST 2014
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Hi all, i have a 1990 740 na and when the brakes get hot and i sit stationary with my foot on the brakes , the rhs front jams on and when i next reapply the brakes i feel a clunk on this side which i assume is the hub assembly moving because the brakes are stuck on. My diagnosis is that the pistons are sticking in the caliper. I should add that i have just purchased the car which i dont believe was driven much lately. Do you concurr or am i missing something? Thanks for your opinions. David








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    sticking caliper 700

    posted by  voice122 on  Mon Apr 18 22:30 CST 2011
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    last visit: Mon Oct 20 00:08 CST 2014
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    Rhys, i put the pads in over three weeks ago and am having trouble remembering, but if i am correct, the first piston rhs was hard to get moving and i remember thinking that the lhs caliper pistons moved much easier. Pistons,pins,hose, what else can go wrong? I first thought ABS (not having much experience with this), but didnt think this was logical. David








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      sticking caliper 700

      posted by  stripping 90 on  Tue Apr 19 05:46 CST 2011
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      last visit: Tue Feb 11 12:20 CST 2014
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      The flexible rubber brake lines can decompose from the inside out, one of the common effects of this is that the rubber hose begins to act like a check valve allowing fluid to easily flow through with foot pressure but not so easily release, one way to test the flex hose is to briefly open a bleeder screw while the caliper is in the frozen position and if the piston immediately relaxes then you will know that the blocked hose was the culprit.








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    sticking caliper 700

    posted by  voice122 on  Mon Apr 18 17:46 CST 2011
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    last visit: Mon Oct 20 00:08 CST 2014
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    Thanks for your input, my first guess was the guide pins so i put new pads in and lubricated the guide pins with special grease for this purpose. There were no funny wear marks of any kind on the pins. Drove off with confidence and dang! the same issue which lead me to think of the caliper pistons. Do you think new guide pins might be the answer. David








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      sticking caliper 700

      posted by  Rhys on  Mon Apr 18 19:04 CST 2011
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      last visit: Tue Nov 20 10:22 CST 2012
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      When you pushed the pistons back in order to install the new pads, did they move smoothly and easily? That's the first clue. If any were tighter that may be the problem. If you lubed the pins well I doubt they are an issue now.







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    sticking caliper 700

    posted by  someone claiming to be fixir2002 on  Mon Apr 18 11:26 CST 2011 [RELATED]

    Yes...this is usually caused by the floating caliper guide pins freezing. They are usually very difficult to get out once they get locked up. I had to jerry-rig a press using a long bolt and a deep socket.








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    sticking caliper 700

    posted by  stripping 90 on  Mon Apr 18 05:58 CST 2011
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    last visit: Tue Feb 11 12:20 CST 2014
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    Impossible to concur w/o physical inspection,it could possibly be a seized guide pin for the floating caliper,combine that with worn pads and the piston could be at such an angle that it would get jammed up. Clunking could be coming from a number of places. Time to go poking around.
    Good luck with new acquisition.







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