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Last Post 03/22/2008 10:23 PM by  Larry Kronemeyer
Seized brake caliper bolt - starting to round-off
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John P
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03/21/2008 9:31 PM

    Hi all, looking for some advice as my car is now stranded in my garage.

     

    I was doing my brakes/front rotors on my STi, and the drivers side top caliper bolt is seized.  I had hit it with PB blaster and let it soak for about 3 hours before I event got to the drivers side, started cranking and pop, the wrench turned but the bolt didn't.  Now the bolt is starting to round off and I've called it quits for the night.  Anyone have some advice on how I can get this bolt out?

     

    Larry Kronemeyer
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    03/21/2008 10:20 PM
    Have you tried heat?  Propane torch at backside of bolt.  Localize the heat to keep from caliper seals.  Tap with hammer and flat punch.  Make sure you use a 6 point socket.
    Andy
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    03/21/2008 10:21 PM
    Is it a 6 point socket/wrench? I have some Freeze-Off penetrating oil that chills the bolt allowing the solution to work better. I can run some by Saturday if you need it.
    MattG
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    03/21/2008 10:39 PM

    6 point socket.  Make sure its the correct size.  One size large on Metric can sometimes work, but will round off.   Impact wrench can sometimes knock a bolt loose when just a wrench wont turn it.  I can load the compressor in the truck and run by if you need help.

     

    John P
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    03/22/2008 2:53 AM

    The problem is this is the 19mm bolt that you can only fit an open-ended wrench.  I can't get a 6-point wrench or a socket on.  You can see the one I have trouble with here:

     

    [url]http://www.iwsti.com/forums/how-ins...;/url]

     It is the one by the blue circled socket that you cannot really fit anything but an open-ended 19mm wrench - no impact socket.  I've got a buddy running his small propane torch over tomorrow am.  Just finished soaking the bolt again in tons of PB lube.  If that combo doesn't work I may be making a few phone calls for help Saturday, I really appreciate the responses.
     

    Andy
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    03/22/2008 10:24 AM

    If the strut mounting bolt is the issue stopping a socket from being used, remove that bolt only to facilitate removing the caliper bolt. If the top strut bolt is tight, the strut shouldn't move and your alignment should be okay.

    The other possibility is to make a  short 6 point socket to use, a bench sander is your friend here.

    rkoradi
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    03/22/2008 1:10 PM

    I can't believe that I'm giving mechanical advice. But I found that a flare wrench fits in many places where you would normally use an open ended wrench, and has a much smaller chance of rounding off bolts:

    http://www.harborfreight.com/cpi/ct...umber=5126

    Based on the picture, it looks like a closed 6-point wrench might fit, too. Which would be even better.

    Of course if you're bolt is rounded off already, it might be too late for any of this. 

     

    John P
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    03/22/2008 3:29 PM
    [quote user="Andy"]

    If the strut mounting bolt is the issue stopping a socket from being used, remove that bolt only to facilitate removing the caliper bolt. If the top strut bolt is tight, the strut shouldn't move and your alignment should be okay.

    The other possibility is to make a  short 6 point socket to use, a bench sander is your friend here.

    [/quote]

     

    Big thanks Andy and to all others for suggestions!  I don't know why I didn't think of removing the strut bolt.  Got that out of the way and my 6-point socket on and a little torch action, broke loose and came right off.

     

    Larry Kronemeyer
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    03/22/2008 10:23 PM
    Breathe, look at situation,breathe, think,breathe, take apart,exhale, and do, then relax! and Sigh!!!  Glad you got it!!
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