Confusing caliper bolt size - JeepForum.com
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post #1 of 15 Old 09-19-2017, 04:28 PM Thread Starter
lgh1157
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Confusing caliper bolt size

I got these calipers from rock auto
91 Jeep YJ, loaded and all that good stuff
Part number RC10186 ad RC10185
I went to put them on and the bolts are a totally different size
I remove the sleeve to see if the original bolt would take the place but it still doesnt fit

I checked a few websites - some say these fut, some dont

What am i missing here ?

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post #2 of 15 Old 09-19-2017, 06:44 PM
dzywicki
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That is definitely not right. The caliper is the right one (by the part # anyway). I would just reuse the bolts that came out and not worry about it all.
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post #3 of 15 Old 09-19-2017, 07:54 PM
puppybreath
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remanned calipers? If so, the bolt holes may have been worn, bored oversize to fit the sleeve, requiring smaller bolts.
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post #4 of 15 Old 09-19-2017, 08:20 PM
azzkicker
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I'm voting it's the wrong caliper, even if it's in the right box. Rock auto sent me the wrong parts once too.

I wouldn't wing it, either, trying to find some bolt that seems to fit. That's a pretty slick mechanism that keeps the calipers square with the rotor, but allows horizontal float with very little slop. If you're not using the right bolts, you might be tearing things up pretty quick.

I wonder if somebody can help with that casting number. Do your original calipers look identical?

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post #5 of 15 Old 09-20-2017, 01:08 AM
timatoe
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Do some searching around on here, Mean Max did a write up on differences in brake hardware a way long time ago. It could even be in the FAQ's.


Anyhow, remember right around '91 is when a lot of stuff started changing, seat brackets, cage, engine etc....


FWIW, I've had good luck for the most part with Rock Auto parts, but one time they sent me a set of Moog ball joints saying they fit the YJ that were nowhere even close to what was supposed to be in there.

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post #6 of 15 Old 09-20-2017, 06:59 AM Thread Starter
lgh1157
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Thank you all for the help
I will check the casting number
I need to sit down and double check everything
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post #7 of 15 Old 09-20-2017, 09:31 AM
puppybreath
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Casting numbers are a baseline at best. Many parts use the same casting, but are machined differently for different applications.
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post #8 of 15 Old 09-20-2017, 07:12 PM Thread Starter
lgh1157
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So, . . . . .. . i feel like a bit if an *A*S*S*H*O*L*E
I hadn't actually sat the calipers next to each other, . . I only discovered the bolt size difference and left it at that ( been busy as ****, drove a truck to houston to drop of donations, started a new job blah blah ), . . . . every caliper i pulled up online looked just like the '91 calipers i ordered

So, ..... I finally had a few minutes tonight and i look at them together and they are totally different haha
So i go back through rockauto and discover my original calipers are from a 87 - 89 front axle, . . . im wondering why this could be ?, . . the jeep is 100% a '91 ( per the wife, . . . i hardly know anything about these jeeps ha )

Does anyone know why i would have the older '87-'89 caliper on a '91 ?

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post #9 of 15 Old 09-20-2017, 07:43 PM
puppybreath
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uhmm, how can you work on something and fail to realize the part a and part b don't look similar in any way?
woulda been solved in 10 minutes if you'd have provided side by side photos in the first post....
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post #10 of 15 Old 09-20-2017, 07:47 PM Thread Starter
lgh1157
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Quote:
Originally Posted by puppybreath View Post
uhmm, how can you work on something and fail to realize the part a and part b don't look similar in any way?
woulda been solved in 10 minutes if you'd have provided side by side photos in the first post....
Car has been in pieces for 1 year, . . everything was stored and i only checked the bolt size.
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post #11 of 15 Old 09-21-2017, 07:00 AM
grapehead
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Someone swapped the front axle. It happens.
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post #12 of 15 Old 09-21-2017, 11:35 AM
puppybreath
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Quote:
Originally Posted by lgh1157 View Post
Car has been in pieces for 1 year, . . everything was stored and i only checked the bolt size.

Oh, That makes sense!
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post #13 of 15 Old 09-21-2017, 09:45 PM
timatoe
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I'm with grape, someoe swapped that axle at some point, maybe from a 4 banger for the 4.10 gears, or who knows...

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post #14 of 15 Old 09-22-2017, 12:07 AM
azzkicker
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Quote:
Originally Posted by puppybreath View Post
uhmm, how can you work on something and fail to realize the part a and part b don't look similar in any way?
woulda been solved in 10 minutes if you'd have provided side by side photos in the first post....
There's no need to be insulting. If you've never bought parts, and didn't side by side compare them until you had a problem mounting it, you just lack experience, or lack honesty. It happens, especially when you have a project apart for a while.

In any case, if everybody solved their problems perfectly on the first go, we'd have no threads to look at. I have been saved from many mistakes by reading how somebody else made one. Don't discourage people from sharing by being an azz.

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post #15 of 15 Old 09-22-2017, 07:08 AM
puppybreath
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read my post after the one you quoted, before that he'd never mentioned them being apart for so long.
If you read what was posted, it reads as though the old were removed and new didn't fit.

And oddly, I compare every part BEFORE I install them, for the simple reason that many places give you crap if the parts have been installed.
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