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Unread 09-12-2009, 12:06 AM   #1
efr523
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Wrong Rotor Size Fix?

I have a 2001 tj sport and I just ordered some new rotors to do a brake job. I found out about the rotor size change a little late and ended up getting the rotors that are 1/8" deeper than i need. I was thinking about taking my cutting torch and cutting the middle out of my old rotors to make essentially about a 1/4" spacer and putting them on the inside of the new rotors to fill up the extra space so the wheel wont seize up. I got a really good deal on some drilled and slotted rotors and don't want to go through the hassle of returning them and ordering new ones. Can anyone see anything potentially harmful by doing this?

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Unread 09-12-2009, 02:16 AM   #2
Boodyrider
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What, other than dying? Nope, go for it.

No **** with the brakes to save on returning the wrong parts dude, you could break studs and kill someone.

Hey, swap in the matching unit bearings!!!


Seriously... send back the wrong, get the right. It's not JUST the depth, the other concern is real. Also, spacing like that will likely cause the calipers to hit on the other side.
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Last edited by rustywrangler; 09-12-2009 at 08:31 AM.. Reason: Language problem, this is your warning.
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Unread 09-12-2009, 03:05 AM   #3
TheBoogieman
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Return them and drilled rotors don't help on Jeeps.
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Unread 09-12-2009, 03:32 AM   #4
Boodyrider
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Here's a thought, return them and buy decent blanks. Interestingly enough, Autostoned blanks (Duralast 'brand') are pretty good ones.
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84 CJ7; frame off restoration in progress.

The technical advice you get from me here is worth exactly what you paid me for it. Warranty issues will be reimbursed at double what you paid me for the advice.
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Unread 09-12-2009, 07:13 AM   #5
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Unread 09-12-2009, 08:42 AM   #6
mrblaine
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Quote:
Originally Posted by efr523 View Post
I have a 2001 tj sport and I just ordered some new rotors to do a brake job. I found out about the rotor size change a little late and ended up getting the rotors that are 1/8" deeper than i need. I was thinking about taking my cutting torch and cutting the middle out of my old rotors to make essentially about a 1/4" spacer and putting them on the inside of the new rotors to fill up the extra space so the wheel wont seize up. I got a really good deal on some drilled and slotted rotors and don't want to go through the hassle of returning them and ordering new ones. Can anyone see anything potentially harmful by doing this?
As greatly as you need a severe amount of abuse for considering such a bad idea, there is a very real problem that you will encounter. It's critical to the function of the brake system that your rotor register perfectly on the pilot that sticks out of the unitbearing. If you examine that pilot carefully, you will find there are two different diameters to it with the larger one next to the flange for the rotor and just outside of that, another diameter for the OEM wheel to register on.

If you space the rotor outwards, it won't register correctly and can cause some issues you may not enjoy.

Just to satisfy my curiosity, but how long did you power through the grinding before you figured it out?
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Unread 09-12-2009, 01:12 PM   #7
efr523
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to satisfy your curiosity 0 seconds i have not done this
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Unread 09-12-2009, 01:25 PM   #8
mrblaine
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Originally Posted by efr523 View Post
to satisfy your curiosity 0 seconds i have not done this
Well, if you haven't run the rotors, take them back and swap them for the correct versions.
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Unread 09-14-2009, 07:28 PM   #9
SHAKEnBLAKE
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I had this same problem today, but I did not think about grinding anything and I called autozone and advance and they weren't picking up each others' part numbers, but both of them had rotors that would rub on the backing plate. They were sure that I had a freak jeep, or "maybe they used parts from the next model year"
but 97 and 99 jeeps had the same part number in their system. This month has been a 100% you get what you pay for kinda month.
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Unread 09-14-2009, 07:47 PM   #10
funshootin1
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Ive got some cross drilled brake lines if you need em. ha
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