Rotor Run Out.
Thread Starter
Team Owner
Joined: Apr 1999
Posts: 21,953
Likes: 1,445
From: Reno Nevada
2024 C3 of the Year Finalist- Modified
Rotor Run Out.
Monday I was coasting out of gear coming over a 8900 foot mountain pass. When I was braking for the turns I would hear a fluttering sound from the right rear.
I was thinking that maybe I had warped a rear rotor out on the track and I needed to surface it and redo the rotor run out.
Yesterday I took it all appart and got the rear tires off the ground and put the dial indicator on the right rear. I sharpie marked the "Zero" point on the rotor and went over to the other side and rotated the tire about 30 - 45 degrees at a time and I would walk back around and look at the dial indicator. The most it moved was less than .001 through a couple of rotations. I was about stumped. So I pulled the rotor off and on the inside face it had a pit missing and an small odd rounding crack. It was a defective rotor I would guess. Typical overheated rotors are just covered with little tiny flex cracks.
I was think how nice it would be if some manufacturer would make us Vette guys a modern full floating calipers and mounts No more rotor run out PITA Like the Wilwood D6 or 8. Get us out of the stone age!
I was thinking that maybe I had warped a rear rotor out on the track and I needed to surface it and redo the rotor run out.
Yesterday I took it all appart and got the rear tires off the ground and put the dial indicator on the right rear. I sharpie marked the "Zero" point on the rotor and went over to the other side and rotated the tire about 30 - 45 degrees at a time and I would walk back around and look at the dial indicator. The most it moved was less than .001 through a couple of rotations. I was about stumped. So I pulled the rotor off and on the inside face it had a pit missing and an small odd rounding crack. It was a defective rotor I would guess. Typical overheated rotors are just covered with little tiny flex cracks.
I was think how nice it would be if some manufacturer would make us Vette guys a modern full floating calipers and mounts No more rotor run out PITA Like the Wilwood D6 or 8. Get us out of the stone age!
Thread Starter
Team Owner
Joined: Apr 1999
Posts: 21,953
Likes: 1,445
From: Reno Nevada
2024 C3 of the Year Finalist- Modified
I machined two rotors I had. This one is about .003 out between these two blue marker lines. I'm going to shim it and all is good again.
Last edited by gkull; Apr 11, 2014 at 06:53 AM.
Safety Car
Joined: May 2008
Posts: 3,747
Likes: 713
From: Lafayette Louisiana
Floating calipers!
I was think how nice it would be if some manufacturer would make us Vette guys a modern full floating calipers and mounts No more rotor run out PITA Like the Wilwood D6 or 8. Get us out of the stone age![/QUOTE]
AGREE!, there is a need to be met, not that hard of a design on the face of it, and certainly a market to make a profit, duh, look at all of the stainless steel sleeved calipers available.
[/QUOTE]AGREE!, there is a need to be met, not that hard of a design on the face of it, and certainly a market to make a profit, duh, look at all of the stainless steel sleeved calipers available.
Thread Starter
Team Owner
Joined: Apr 1999
Posts: 21,953
Likes: 1,445
From: Reno Nevada
2024 C3 of the Year Finalist- Modified
After shimming to "Zero" all the way around and bleeding the brakes to pump the old fluid out it is time to put it back together on this side and do the left rear for the fun of it.
Thread Starter
Team Owner
Joined: Apr 1999
Posts: 21,953
Likes: 1,445
From: Reno Nevada
2024 C3 of the Year Finalist- Modified
Nothing like a day off because I worked over the holiday weekend.
The other side was slightly over .001. So instead of mucking with it to make it Zero I had my aunt pump the brakes while I bleed the left rear. New Motul 600 degree.
I live in dry low humidity climate. rust is non existent. But most of you guys need to do the pump through bleed adding fluid to keep the water out of you brake pistons.
I would also like to put out the invite to any c-3's around here that I would show and help you do a 4 wheel brake job
The other side was slightly over .001. So instead of mucking with it to make it Zero I had my aunt pump the brakes while I bleed the left rear. New Motul 600 degree.
I live in dry low humidity climate. rust is non existent. But most of you guys need to do the pump through bleed adding fluid to keep the water out of you brake pistons.
I would also like to put out the invite to any c-3's around here that I would show and help you do a 4 wheel brake job
Last edited by gkull; Sep 5, 2013 at 04:26 PM.
Thread Starter
Team Owner
Joined: Apr 1999
Posts: 21,953
Likes: 1,445
From: Reno Nevada
2024 C3 of the Year Finalist- Modified
Time to go take a ride on the new rotor. My buddy lives 20 miles away an he doing a 496 injected 68 BA Camaro drag car,
You just have to love a caged c-3 with 335 rear ties
You just have to love a caged c-3 with 335 rear ties
Supporting Vendor
Joined: Jun 2008
Posts: 2,199
Likes: 119
From: tempe Arizona
The discs being so small there's no place to put the hat to rotor interface. And if they were the same size..they would not work any better from a braking stand point, only aide in expansion issues and rattle when cold. All at a cost of perhaps $900pr. 
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