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Old 12-12-2019, 11:55 AM   #1
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Stuck bolt

While removing the rear brakes, the top 10mm bolt locked up halfway out. The bottom came out nice. Waiting for penetrating oil but its tight.

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Old 12-12-2019, 12:37 PM   #2
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Your rotor indexing screw is missing.
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Old 12-12-2019, 12:40 PM   #3
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I've been known to use alternating heat (torch) and then cold (dry ice) to "un-stick" stubborn bolts.

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Old 12-12-2019, 02:06 PM   #4
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For years My wife was correct. I had a loose screw.
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Old 12-12-2019, 02:18 PM   #5
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Cover the thread in a candle wax then screw it in back in then back out keep applying the wax hopefully slowly slowly it will come out.
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Old 12-12-2019, 02:37 PM   #6
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I've been known to use alternating heat (torch) and then cold (dry ice) to "un-stick" stubborn bolts.

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Seems like a good idea. I suppose you apply heat to the surrounding metal, and the ice to just the bolt? Or not?

Another (possibly dumb) question: where do you get a small amount of dry ice?
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Old 12-12-2019, 02:52 PM   #7
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I wish you luck. I had a front caliper bold break on me. I ended up having to get a new\used hub from Woody. The best penetrating oil I found is called Kroil. I think you can find it at Napa.
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Old 12-12-2019, 03:29 PM   #8
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While removing the rear brakes, the top 10mm bolt locked up halfway out. The bottom came out nice. Waiting for penetrating oil but its tight.
Mix acetone and ATF half and half.
Shake hell out of it each time you use it.
Seal it up when on the shelf as the acetone evaporates rapidly.
Works better then anything I have ever used.
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Old 12-12-2019, 05:13 PM   #9
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I've never used dry ice to get stuck bolts out, but I have used a torch. Just get the bolt and the hub right around the bolt hot and see if that does it. Blue99's idea of using wax on the threads is interesting, I've never heard of that. Maybe you can find a money scented candle for the wax, the car will probably like that scent the best.

If you get it out successfully, make sure to chase the threads in the hub with a tap, and use a new bolt.

Good luck!
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Old 12-12-2019, 05:26 PM   #10
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I have had success with drilling out the center with ever increasing sizes. Try to get all the way through the bottom. When you get to +/- 0.312", lube it up again and try a screw extractor. A couple of heating and quenching cycles will also help. Just don't get carried away with the heat. Give the lube time to work, patience will be rewarded.
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Old 12-12-2019, 05:26 PM   #11
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I tried heat first, Carful not to cook any brake fluid/lines in the process. No luck. Going for the acetone concoction next. Thanks for the imput.
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Old 12-12-2019, 06:23 PM   #12
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you say it came part way out then locked up.????
I wonder if it is cross threaded?
If you can turn it in- try working it in and out with the acetone -ATF concoction I mentioned. When you use it let set for half hour or so after you put it on the bolt before you try to get it out.
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Old 12-12-2019, 06:53 PM   #13
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It's odd that it gets stuck halfway out. Have you tried bolting the bottom bolt back in? Having the bottom bolt in maintains the caliper alignment and relieves lateral pressure on the stuck bolt.
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Old 12-12-2019, 06:55 PM   #14
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It did create a gap behind the caliper before it bound so I poured the special sauce as close to the base of the bolt that I could. It didnít feel crossed, more of a galled feeling.
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Old 12-13-2019, 04:29 AM   #15
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It did create a gap behind the caliper before it bound...
I don't know how much play there is between the bolt and the thru-hole on the caliper, but what you're describing seems to me like the bolt is binding up on the caliper itself, not the threaded parts. Try running the bottom bolt back in and snug it up. This will help keep the caliper down while you're working the other bolt out.
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Old 12-13-2019, 04:38 AM   #16
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The caliper will slide ( a little) on the bolt shaft. I have about 3/4 in. of thread still in the hub. The bolt I got out looks to have been coated in something. The threadd are not clean but it came out nice.
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Old 12-13-2019, 04:39 AM   #17
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Unfortunately, I think the damage is done. From what I've experienced, if the bolt starts coming out and then gets jammed up. Part of the aluminum threads have stripped and are attached to the bolt. As the bolt is coming out, those stripped threads are now binding against good threads. I hope I'm wrong
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Old 12-13-2019, 05:25 AM   #18
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That's what I thought until I put a magnet on it and it stuck. They both look the same. I was wondering if low and slow torque or high impact would lessen the chances of it breaking.
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Old 12-13-2019, 05:27 AM   #19
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Unfortunately, I think the damage is done. From what I've experienced, if the bolt starts coming out and then gets jammed up. Part of the aluminum threads have stripped and are attached to the bolt. As the bolt is coming out, those stripped threads are now binding against good threads. I hope I'm wrong
Ah yes, that's aluminum. I forgot about that. Aluminum and steel don't like each other. There is bad chemistry between them.
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Old 12-13-2019, 05:29 AM   #20
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Likely you're screwed. Snap it off, drill it out, timesert it. Good as new.

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