Turning rotors
Race Director
Joined: Jul 2004
Posts: 12,692
Likes: 329
From: Scottsdale Arizona
Others may disagree, but I've never been a big fan of turning rotors. If they're bad, replace them. This is unless they're very hard to get, very expensive or simply need a tiny bit of rust removal. Turned rotors will end up warping much faster than those at original thickness.
I've replaced pads and left the rotors even when slightly rivet scored and not found noticable reduction in braking performance (though I probably reduced the longevity of the pad). I don't routinely turn the rotors any more.
My $0.02
I've replaced pads and left the rotors even when slightly rivet scored and not found noticable reduction in braking performance (though I probably reduced the longevity of the pad). I don't routinely turn the rotors any more.
My $0.02
Tech Contributor
Joined: Aug 1999
Posts: 15,154
Likes: 3,959
From: Connecticut, USA
Bolt the new rotors on the hubs and set the bearings. Check runout with an indicator. If you have less then .003" you're ok. If you have more, then either shim them to a better runout or have them kiss cut. If you cut them, you have to be sure they are fastened to the hub or you'll loose your cut runout. You can tap the old rivet holes and countersink them to accept 3/8-24 socket flat head bolts or have them riveted.
Gary
Gary
Banned Scam/Spammer
Joined: May 2003
Posts: 687
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Why are you replacing the hubs? The factory turned the hub/rotor as a unit; if you can find someone you trust to do this correct thats what I would do. If you don't rivit them back together, make sure you don't lose their relative postion to each other.
Safety Car
Joined: Jun 2002
Posts: 4,745
Likes: 2,489
From: Buckeye, AZ
St. Jude Donor '12-'13
I've always turned my rotors especially vintage ones as there are much thicker; current model cars are designed to be replaced. Most older rotors were good for (2) cuttings. This is to eliminate runout (causes wheel to shake when braking) and glazing (causes squeaking). I have never had a problem wiht turning rotors. Be careful, some cars must be turned on the car. Older Corvettes can be turned by a reputable parts store. the last time I took mine in the guy came out with a smile on his face. He said that his machine was working hard to cut them and he hadn't had any in that heavy and hard in awhile.
Thread Starter
Racer
Joined: Oct 2004
Posts: 439
Likes: 0
From: Mukilteo Washington
Originally Posted by gliot1
I've always turned my rotors especially vintage ones as there are much thicker; current model cars are designed to be replaced. Most older rotors were good for (2) cuttings. This is to eliminate runout (causes wheel to shake when braking) and glazing (causes squeaking). I have never had a problem wiht turning rotors. Be careful, some cars must be turned on the car. Older Corvettes can be turned by a reputable parts store. the last time I took mine in the guy came out with a smile on his face. He said that his machine was working hard to cut them and he hadn't had any in that heavy and hard in awhile.
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