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Thread: caliper rebuild?

  1. #1
    Join Date
    Aug 2004
    Location
    detroit
    Posts
    957

    Default caliper rebuild?

    i just tore the front end of my car off, (not for real) im doing breaks and thrust arms (lemfoder) with 750il bushings. ordered the stuff from BMA, it was very prompt for free shipping, i was suprised. anyways, on my front right caliper somehow the boot tore on the piston, then i let it sit for a week or so and it rusted on like half of the piston, anyways so i was going to just buy a caliper, it was like 40-50 for a rebuild, but then i looked and it had a core charge so i decided rather then get myself 100 dollars in i would just try to rebuild the caliper. how much trouble am i in for? any suggestions? e34.net has nothing for this, also while i have this thing apart is there anything else you think i should take care of? i def have the 55 shimmy, and its bad under breaking but i attribute the to terrible break, (both the caliper and in turn the rotor, and also the thrust arms. last question i will sneak in under my caliper rebuild thread, what about sway bar links, i noticed that my boots are torn, is this going to affect driveabalitY?

    thanks a ton

    kyle

  2. #2
    Join Date
    Jul 2004
    Location
    Vancleave, MS
    Posts
    629

    Default think you need new caliper....

    ....once the rust sets in unless you can clean it w/a brass brush or something.... the (new) boot (from a rebuild kit) may not seal, thus fluid leak...etc etc....

    rebuild kit from BMA is pretty cheap though... there are sites to tell how...can't think of any off top of my head... good luck.
    1993 / 525ia / M50TU / EAT / Sachs / Infiniti Kappa & Basslink / super clean / Style 5s wearing Pilots / Mobil 1 everywhere / long road ahead

  3. #3
    Join Date
    Dec 2003
    Location
    Eastern Tennessee USi
    Posts
    14,839

    Default

    Brakes Brakes Brakes Brakes

    sway links should be replaced, when they get play you will have a new little clunking friend. I agree with the other post about cleaning the rust, if it comes off easy your okay.
    95 E34 530I V2.37
    ===========
    Those who make peaceful revolution impossible will make violent revolution inevitable.

    John F. Kennedy

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

    Default

    Being the cheap screw that I am I've rebuilt a number of calipers and wheel cylinders(remember those). Anything more than a LIGHT rust is going to leak with a home hone job.
    It's a messy job, if quality remans are available go that way. That's my advice.
    "The gas pedal wouldn't go to the floor if it weren't meant to be there"

  5. #5
    Join Date
    Aug 2004
    Location
    detroit
    Posts
    957

    Default

    whats about sand blasting? the piston i mean

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

    Default

    Just buy a caliper and save yourself a big PITA
    "The gas pedal wouldn't go to the floor if it weren't meant to be there"

  7. #7
    Join Date
    Dec 2003
    Location
    Eastern Tennessee USi
    Posts
    14,839

    Default

    that will cause serious pits! The caliper pistons are highly polished.
    Quote Originally Posted by kyleN20
    whats about sand blasting? the piston i mean
    95 E34 530I V2.37
    ===========
    Those who make peaceful revolution impossible will make violent revolution inevitable.

    John F. Kennedy

  8. #8
    Join Date
    Jan 2004
    Location
    Tampa Bay, Florida, USA
    Posts
    900

    Default

    You can get rebuild OEM calipers pretty cheap; less hassle than rebuilding IMHO
    Ramon
    1994 540iA Nikasil EAT Chip
    Tampa Bay, Florida USA

  9. #9
    Join Date
    Oct 2004
    Location
    Honolulu
    Posts
    3,105

    Default Rust?

    You'd think the pistons would be plated with cadium or something.

    I'd replace the calipers. Rusty piston doesn't sound right.


    Vee ave vays of dealing vid your kind...........

  10. #10
    Join Date
    Jun 2006
    Location
    Frederick, MD
    Posts
    254

    Default

    Not to highjack this thread, but since we are on the subject, does anyone know a good way to reduce caliper rattle when going over small bumps?

    My psg. side rear wheel has the same rattle that my old 325 had, and it's getting on my nerves.

    I am no mechanic, just curious if I can do this in the driveway or if it is something I need a shop to look at.
    1990 535i
    117,000mi
    Feederick, MD

    If it has **** or tires, you are going to have problems.

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