Rotor runout how to?
Thread Starter
Racer
Joined: Feb 2010
Posts: 494
Likes: 0
From: Leominster MA
Rotor runout how to?
Ok so i have the dial guage and everything set to go. My question is do I griand the backside of the rotor to correct runout, the hub, or shim it?
I have quite a bit of runout on one, 8 at least.
Is there a good write up somewhere on how this is done?
I have quite a bit of runout on one, 8 at least.
Is there a good write up somewhere on how this is done?
Melting Slicks
Joined: Mar 2006
Posts: 3,456
Likes: 102
From: Piedmont Va
St. Jude Donor '11-'12-'13,'19-'20
only I went a little more hi-tech than Eddie, I actually bought shim stock..
McMaster-Carr has sheets in different thickness...although you do end up with a lot more thea you need...so Eddies method is certainly cheaper...I believe the only real way to get them true by grinding is to attach them together and turn them as a unit like they did in the factory.
Melting Slicks
Joined: May 2007
Posts: 3,246
Likes: 4
From: Bay Area CA
If there new, you can get them turned on the car at a GM dealership, with one of the NEW bolt to hub machines. that will also correct it. spray mark one stud/hole if you go this route for future indexing reference.
Le Mans Master
Joined: Apr 2007
Posts: 7,353
Likes: 72
From: Graceland in a Not Correctly Restored Stingray
With a nod to the case often made against using them, I've had no issue with the shims I got from Guldstrand, and I don't exactly tend to just trundle around...
Melting Slicks
Joined: Jun 2009
Posts: 2,343
Likes: 4
From: Anderson SC
Do all the dealerships shave this ability now?
Do they have to remove the caliper to do this?
-W
Racer
Joined: Mar 2005
Posts: 294
Likes: 1
From: Racine Wisconsin
Brake Align makes tapered shims to correct various amounts of runout. http://www.brakealign.com/pages/products.htm According to their tech support, they are available at GM dealerships.
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Thread Starter
Racer
Joined: Feb 2010
Posts: 494
Likes: 0
From: Leominster MA
I ordered a bunch of shim stock and a punch set from mcmaster today, I gotta get this thing back together. and sorry but im not turning my brand new rotors (slotted and dimpled at that)
I really dont think shims are " that bad " of an idea ( just my opinion )
LOL
I really dont think shims are " that bad " of an idea ( just my opinion )
LOL
Melting Slicks
Joined: Mar 2006
Posts: 3,456
Likes: 102
From: Piedmont Va
St. Jude Donor '11-'12-'13,'19-'20
Best decision you could have made! I feel the same way about turning brand new rotors...plus you learn something doing it this way! 
Le Mans Master
Joined: Aug 2006
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From: mount holly NC
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Race Director
Joined: May 2006
Posts: 16,528
Likes: 53
From: Dayton, Ohio
Do they turn the rotor with the half shaft attached or removed ?
Racer
Joined: Jun 2006
Posts: 476
Likes: 0
From: Easton PA
Race Director
Joined: Jul 2001
Posts: 15,892
Likes: 42
Another reason NOT to turn rotors,
www.oeqf.com/techinfo/index.htm
www.oeqf.com/techinfo/index.htm
Race Director
Joined: May 2006
Posts: 16,528
Likes: 53
From: Dayton, Ohio
(thats usually as your going down the exit ramp trying to stop behind the line of cars at the light) Seriously , and until you have had that happen runout don't mean ****. Spoooooky
Race Director
Joined: May 2006
Posts: 16,528
Likes: 53
From: Dayton, Ohio
Thread Starter
Racer
Joined: Feb 2010
Posts: 494
Likes: 0
From: Leominster MA
Shim stock came in from mcmaster, SS, worked fine. I got them to about 2.5 thou. Close enough?? I have SS sleeve calipers if that matters. (new ones too)
Anyone need any shim material LOL.
Anyone need any shim material LOL.
