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Thread: Why would brake caliper slide pins keep seizing up?

  1. #1
    ethanol sniffing Backyard Mechanic adamaw11's Avatar
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    Default Why would brake caliper slide pins keep seizing up?

    Car is an '88 aus delivered AW11, stock brakes.

    I find my brake caliper slide pins keep seizing up.
    I clean them and regrease them, but every time I've checked them again after driving the car, I'll find the pin is seized quite firmly, takes a fair bit of force with pliers to get the pin to move, to then take it out and clean it again.
    Its usually after a track day I'll check them, since I'll find the brakes will loose a lot of bite.

    Is this just a symptom of old brake calipers? as they have 330000 ks on them, can't actually get brand new calipers anymore, and secondhand replacements might have the same problem.
    I was quoted $600 to recondition the calipers.

    I'm using high temperature bearing grease (Castrol HTB 2) on the pins. Is there a better option that won't seize up so quickly?
    Or do I just need to clean the bore out more thoroughly?

    Adam.
    http://www.toymods.org.au/forums/showthread.php?t=83259
    '88 A.D.M aw11 '98 4age 20v blacktop
    NA: [email protected] at willowbank. On E85 with 6psi boost: [email protected] ~8psi: 13.187 @169.9kmh. >10psi: 12.9 rod fragments @ 174mm holes in block
    daily: '93 ae101 Levin coupe. Motorbike: '09 Suzuki GSR600: [email protected] at Willowbank

  2. #2
    Forum Member 1st year Apprentice
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    Default Re: Why would brake caliper slide pins keep seizing up?

    Adam
    First you need to inspect the caliper and clean the I.D. [if the ID is real rough you may have to sleeve the calipers]. Polish the pin O.D.s in drill will fine 400# paper, if you can not get new sliding pins.
    Next go to an industrial supply and get a can of Fel-Pro C5-a Hi-Temp anti-seize. Get the smallest can, they have, even that will last 50yrs. That same stuff also works great on sealing exhaust gaskets.
    Davew7

  3. #3
    Junior Member Backyard Mechanic
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    Default Re: Why would brake caliper slide pins keep seizing up?

    Quote Originally Posted by adamaw11 View Post
    Car is an '88 aus delivered AW11, stock brakes.

    I find my brake caliper slide pins keep seizing up.
    I clean them and regrease them, but every time I've checked them again after driving the car, I'll find the pin is seized quite firmly, takes a fair bit of force with pliers to get the pin to move, to then take it out and clean it again.
    Its usually after a track day I'll check them, since I'll find the brakes will loose a lot of bite.

    Is this just a symptom of old brake calipers? as they have 330000 ks on them, can't actually get brand new calipers anymore, and secondhand replacements might have the same problem.
    I was quoted $600 to recondition the calipers.

    I'm using high temperature bearing grease (Castrol HTB 2) on the pins. Is there a better option that won't seize up so quickly?
    Or do I just need to clean the bore out more thoroughly?

    Adam.
    Hi Adam. I have some part numbers available for MR2. Upper caliper bush for 08/88- 11/89 is 47779-16010, Amayama have 5 available at $8.99 AUD each. Lower bush for 08/88- 11/89 is 47769-12030 and Amayama have 10+ for $10.73 AUD. There are two different bolts/pins depending on length, 90119-09003 dimensions 9mm OD x 1.25mm pitch- 71 length with 25mm thread at $9.55 AUD each 2 of required. Or the other original number has been replaced with 90119-09008, dimensions: 9mm x 1.25 pitch- 91mm long with 25mm thread at $4.55 AUD, 10+ available. These are current Amayama prices off their website.
    There is some parts listed for 11/84 - 8/88. You have to check build date for me to try searching for that date range.

    Tony.
    Last edited by ToyTA22; 25-05-2019 at 08:59 AM. Reason: missed info

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