caliper removal - allen wrench size? - JeepForum.com

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post #1 of 19 Old 12-01-2009, 02:24 PM Thread Starter
JIBTEXHNKA
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caliper removal - allen wrench size?

I can't find the right size allen wrench to remove the two bolts that hold the brake caliper. These are the two that have the little rubber sleeves around them. the 4x4explor.com Aussie locker install write-up says to remove them with a 1/2" socket, but they're working on a TJ. The other write-up I'm looking at makes no real mention of them but that's on a '91... Haynes implies that the caliper design is different in pre-1990 models (mine is an '87).

The picture caption says "Using an Allen wrench, unscrew the two caliper mounting pins".

They seem just a TINY bit too small for a 5/16th or 8mm. 1/4 and 6mm are both much too small. Maybe a 7mm might fit? If that even exists.

How on earth do you get these off??

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post #2 of 19 Old 12-01-2009, 02:36 PM
jbolty
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are they maybe torx? chances are the bolts are not original, mine are currently 10mm hex bolts.

else, trial and error on the allen size.

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post #3 of 19 Old 12-01-2009, 02:38 PM
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A T50 torx turned mine the last time I worked on them. I also know they could be 8 and 10 MM hex.


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post #4 of 19 Old 12-01-2009, 06:45 PM
93jeepyj
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Are they 3/8? its been a while since ive had my brakes apart and its probably time again but I seem to remember buying a 3/8 allen socket for this.
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post #5 of 19 Old 12-01-2009, 06:52 PM
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mine are 1/2 hex heads

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post #6 of 19 Old 12-01-2009, 06:53 PM
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there torxs bits not allen head bits
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post #7 of 19 Old 12-01-2009, 07:15 PM
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maybe they are torxs on a xj but on a yj they are 7mm allen head, I just went out an checked

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post #8 of 19 Old 12-01-2009, 10:57 PM Thread Starter
JIBTEXHNKA
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they are NOT torx bits. a 3/8ths allen would be too big.

just found this in the "similiar threads" section down below:
http://www.jeepforum.com/forum/f12/i...wrench-386657/

for some reason that's always better at finding what i want then the search, ha. 7mm it is.
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post #9 of 19 Old 09-01-2012, 10:39 PM
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Factory caliper bolts on 90 YJ's are 8mm, 12 point socket, not torx. You have to use a 12 point socket or wrench.
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post #10 of 19 Old 09-02-2012, 05:02 AM
Mark05059
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Quote:
Originally Posted by HootyBenooty View Post
Factory caliper bolts on 90 YJ's are 8mm, 12 point socket, not torx. You have to use a 12 point socket or wrench.
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post #11 of 19 Old 09-02-2012, 02:42 PM
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When I did my calipers they were the external style torx on mine and the PO buggered them up so bad I had to use a pipe wrench to get them off. The new calipers cam with new bolts thank god and they were 3/8 or 10mm I am not sure which. I have no idea what they came from the factory with.
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post #12 of 19 Old 09-02-2012, 05:59 PM
dancytron
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Quote:
Originally Posted by HootyBenooty View Post
Factory caliper bolts on 90 YJ's are 8mm, 12 point socket, not torx. You have to use a 12 point socket or wrench.
This is what mine had. The craftsman "works on every kind of bolt" socket set got it off.
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post #13 of 19 Old 09-28-2015, 10:10 AM
hackera40
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You are the man! Your information about the size and type of socket was "spot on". Thanks!
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post #14 of 19 Old 09-28-2015, 10:51 AM
mike134
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and hence the reason they never list the bolt sizes. They always change from model to model and year to year
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post #15 of 19 Old 09-28-2015, 11:44 AM
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For my 89 they were definitely Allen.

Edit: I misread, immediately assumed we were talking about the slide pins. Yeah they are a metric 12 point socket.

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