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Thread: Seized brake slide bolt. Ideas to un-seize it?

  1. #1
    www.malicious.com.au Automotive Encyclopaedia ReQuieM's Avatar
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    Default Seized brake slide bolt. Ideas to un-seize it?

    Hi all,

    Got a brake calliper and saddle, the slide bolt into the saddle has seized in place. I'm currently trying to get it out so I can re-use the complete calliper.

    I've tried soaking it in wd-40, hitting with a air impact wrench and have just soaked it in vinegar and tried the impact wrench again with no luck. The saddle now looks like new but with a busted slide boot and a seized slide bolt!

    I'd rather not heat it up with the TIG, as I don't want to risk warping or damaging it. I could put it in a vice and chain / rope the slide bolt and try to yank it out but I'm pretty sure that would be futile.

    Any ideas appreciated.

    Cheers!
    Malicious

    Illustration, Design, etc... www.malicious.com.au

    RIP James Nicol (ViPeR_NiPPleX)...

  2. #2
    Backyard Engineer Domestic Engineer airfireman1's Avatar
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    Default Re: Seized brake slide bolt. Ideas to un-seize it?

    You could try this stuff, I have heard it pricey but it may work.
    http://chemtools.com.au/index.php/lu...ze-and-unseize
    Cheers Dave


    1977 RA28
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  3. #3
    Junior Member Grease Monkey
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    Default Re: Seized brake slide bolt. Ideas to un-seize it?

    The heat is the best way, but as u have said you don't want to use it so I'm not sure you will have much luck with out it

  4. #4
    spank that naughty.. Grease Monkey
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    Default Re: Seized brake slide bolt. Ideas to un-seize it?

    i use a plumbers blow torch and liberally apply wd 40 when its "warm" to wick in.
    you could play nutty professor with an ice cube .....but usually it works or not
    if the slide is damaged to the point where you are replacing it try welding a bar or nut to it for more traction , the welding heat some times breaks the bond
    and every time i replace brake pads i squeeze a bit of nickel anti seize into the sliders and give them a bit of love
    Remember this is a recreational activity ......

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  5. #5
    Forum Member 1st year Apprentice
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    Default Re: Seized brake slide bolt. Ideas to un-seize it?

    i'd use a pipe wrench and a cheater pipe to get more leverage

  6. #6
    Cressidaspert Carport Converter andrew_mx83's Avatar
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    Default Re: Seized brake slide bolt. Ideas to un-seize it?

    Quote Originally Posted by sc400 View Post
    i'd use a pipe wrench and a cheater pipe to get more leverage
    +1 for moar leverage, BFO breaker bar and apply a shock load to it rather than continuous force (ie jump up and down on it)

    Also i use "Penetrene" for stubborn stuff, works better than wd40 etc
    There is no substitute for PUBIC inches

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  7. #7
    Junior Member Backyard Mechanic
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    Default Re: Seized brake slide bolt. Ideas to un-seize it?

    On important parts it is much better to use an electric air/heat gun as it does not apply a hot spot like a flame does but heats the whole area..

  8. #8
    Junior Member Backyard Mechanic
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    Default Re: Seized brake slide bolt. Ideas to un-seize it?

    Go get a caliper kit then either one of two things, one needs a BBQ and the other a suitable sized empty but clean paint tin (and that is tin not plastic bucket and yes you will want the lid). Firstly you can either throw the whole lot on the gas BBQ for a while or even in the oven (make sure that the Mrs isn't home) and heat it for a while. Place in vice and using the afore mentioned BFO breaker bar give it a good yank, should come undone. Be sure to let all components cool naturally.

    The paint tin method is to place the caliper into a suitable sized paint tin, 3/4 fill the tin with diesel and top the rest off with petrol to thin the diesel then let it soak for a few days, you want a paint tin so you can seal it up for obvious reasons.

    I deal with this sort of thing a lot with the rear calipers on the LC76/79s that one of my companies clients has a fleet of in a coal mine. Happens so often that we get good prices on new calipers and I keep and recondition and rotate what comes off using the methods described
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    Default Re: Seized brake slide bolt. Ideas to un-seize it?

    try this: http://www.permatex.com/products/pro...netrant-detail

    it is alot more aggressive compared to wd40.

  10. #10
    Junior Member Conversion King TheStitt's Avatar
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    Default Re: Seized brake slide bolt. Ideas to un-seize it?

    Yeild... Aweosme stuff we use it in the water industry
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  11. #11
    busy adding lightness Too Much Toyota MR22ZZ's Avatar
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    Default Re: Seized brake slide bolt. Ideas to un-seize it?

    or Inox... all those mentioned penetrating sprays work better than WD40.
    Past Toyotas - Snow White (TA23), Blue Stivo (ZZE123)
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  12. #12
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    Default Re: Seized brake slide bolt. Ideas to un-seize it?

    Quote Originally Posted by TheStitt View Post
    Yeild... Aweosme stuff we use it in the water industry
    Agreed!!!
    Rather than fucking it up with too much brute force and ignorance, go to Blackwoods and get a can of Yield! Expensive but awesome. We use it extensively at the steel works (BTW, Fitter and Machinist by trade) and nothing suffers from rust like an old steel works (massive amounts of heat (ever watched 100ish tonnes of molten steel slosh around like water??) and water!)!

    And heat doesn't guarantee release. I once had a threaded adjuster on 1 of my cars that I couldn't get to free up with application of heat (oxy torch) without feeling like it was about to destroy the threads. Yield sprayed inside said adjuster, I let it soak for days 'cause I could and then I was able to undo it, clean it and slapped on some never seize.
    Quote Originally Posted by oldcorollas
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