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Thread: left rear brake caliper jammed in place...

  1. #1
    Join Date
    Nov 2004
    Posts
    205

    Default left rear brake caliper jammed in place...

    i really dont know what happened... on my way back home, i noticed that i somehow couldnt accelerate...

    i stopped and checked what could be wrong, i then saw my left rear tire smoking... the left rear caliper jammed while on brake position...

    what could have happened there?

    i tried bleeding it, but no fluid came out of the screw, tried the main line to the caliper... still no fluid...

    what do i do now? i blocked of the line and m running on 3 brakes

  2. #2
    Join Date
    Jul 2005
    Location
    New York
    Posts
    1,750

    Default

    your caliper froze. you gotta replace it.


    Quote Originally Posted by Alexlind123
    You're my hero.

  3. #3
    Join Date
    Dec 2003
    Location
    Eastern Tennessee USi
    Posts
    14,781

    Default

    sometimes the rubber line swells inside and will block the fluid from releasing.
    95 E34 530I V2.37
    ===========
    Those who make peaceful revolution impossible will make violent revolution inevitable.

    John F. Kennedy

  4. #4
    Join Date
    Jan 2004
    Location
    Dallas, TX
    Posts
    155

    Default

    I would replace/rebuild the caliper and the brake line. Then, do the same thing on the other side. IIRC, rebuilt calipers are really cheap compared to some other cars I own, so a rebuilding yourself is not likely worth the time. Brake lines are a no brainer if you have the system open on that corner anyhow. A pretty easy job on the 5er.
    Robert Callaway
    Dallas, TX
    '94 530im 143k mi
    '94 Land Cruiser FZJ-80 202k mi.

    "If I could have back all the time and money I ever spent on cars.......I'd spend it all on cars."

  5. #5
    Join Date
    Nov 2004
    Posts
    205

    Default

    ok... got the piston out...

    it seems that the boot and the o-ring seems to be ok...
    it came out slowly as i pushed shop air into the system...

    how easy is it supposed to go out? will it just shoot out...
    or will be pushed slowly...

  6. #6
    Join Date
    Apr 2006
    Location
    Chicago, Il. U.S.A.
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    4,243

    Default

    The piston should pop right out. Also be sure the caliper slides freely on the mounting boltsso the brake doesn't drag.
    An internally collapsed brake hose can restrict fluid flow back to the master cyl. causing a drag also, but not likely enough to lock a wheel.
    Get a new or rebuilt caliper and lube the slide bolts with silicone grease and you should be fine.
    "The gas pedal wouldn't go to the floor if it weren't meant to be there"

  7. #7
    Join Date
    Nov 2004
    Posts
    205

    Default

    it moves slowly... it does not really pop out quickly...

    btw, whats in the rebuilding kit?

    the boot and an o-ring only?

  8. #8
    Join Date
    Apr 2006
    Location
    Chicago, Il. U.S.A.
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    4,243

    Default

    Yes other than machining the bore that's all thats needed, okay a bleeder screw too.
    Chances are from your description the bore is badly corroded and beyond a home rebuild. Deep pitting from rust will prevent a proper seal removing enough material to get past the pitting will also cause sealing problems or even a piston to rock in the bore.
    If you see any corrosion in the bore at all replace it for ~$50 and be done, the seals will cost $10-15 and you will spend time f'ing around and make a big mess.
    "The gas pedal wouldn't go to the floor if it weren't meant to be there"

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