Rotor rubbing on caliper?
Thread Starter
Race Director
Joined: Jun 2004
Posts: 13,957
Likes: 706
From: WI
Rotor rubbing on caliper?
While inspecting the car after my last event I just found the rotor rubbing the inside of the caliper. Has anyone seen this before?
Nothing seems to be broken or lose. The grove is slightly deeper on the bottom of the caliper compared to the top. Both side of the car are the same. The fire path of the pad is aligned good on the rotor.
Nothing seems to be broken or lose. The grove is slightly deeper on the bottom of the caliper compared to the top. Both side of the car are the same. The fire path of the pad is aligned good on the rotor.
Last edited by Aardwolf; Sep 24, 2010 at 07:59 PM.
Race Director
Joined: Sep 2005
Posts: 10,878
Likes: 1
St. Jude Donor '07
Your rotor looks rusty. Might not be rubbing. Perhaps a previous owner or repair shop put the wrong size on for a little while? I would think that you would hear that noise quite loudly if it were happenning real time.
Safety Car
Joined: Dec 2006
Posts: 4,290
Likes: 6
From: St Marys GA
Are you sure it's still rubbing? Maybe something was wrong in the past that damaged the calipers, but everything's fine now...? I'd put some paint on the scratch marks, put it all back together, then take it back apart in a few hundred miles and see if the paint is scratched off.
Thread Starter
Race Director
Joined: Jun 2004
Posts: 13,957
Likes: 706
From: WI
The caliper and rotor are fairly new. There is no rust, the Carbotech pad sheds red/orange colored dust.
I did put it back together and did not have to force the caliper into place. Which tells me something is happening on the track to cause the rubbing.
I did put it back together and did not have to force the caliper into place. Which tells me something is happening on the track to cause the rubbing.
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Le Mans Master
Joined: May 2006
Posts: 9,226
Likes: 9
From: Irvine Ca
The only way that could be happening is of the wheel bearing is out and allowing the hub to move around.
Let me rephrase that, I think that is the only way it could happen. I am not really that smart so I could be way off
My .02 cents.
Let me rephrase that, I think that is the only way it could happen. I am not really that smart so I could be way off
My .02 cents.
Burning Brakes
Joined: May 2006
Posts: 857
Likes: 1
From: Morrisonville Illinios
It is really obvious that the rotor is making contact with the caliber look at all the shinny stuff. Are there any bushings that go around the bolts for the caliber that could be worn causing it to drop?
Keep looking I am sure you will find it. Good Luck wro87
Keep looking I am sure you will find it. Good Luck wro87
Le Mans Master
Joined: Sep 2003
Posts: 5,874
Likes: 0
From: Littleton CO
Could the rotor diameter be increasing when they are heated up at the track? I'm sure it happens to some extent, but don't have a feel for how much one would expect. Perhaps the adapter brackets counteract or negate whatever consideration was made for thermal expansion in the stock C5 system.
Last edited by jrp; Apr 30, 2008 at 01:41 PM.
Le Mans Master
Joined: May 2006
Posts: 9,226
Likes: 9
From: Irvine Ca
thinking that the over all diameter of a rotor is going to grow by .060" is quite a reach.
Understand, I don't know the gap between your rotor and your caliper, but thinking the gap is less than .020" of an inch just is not conceivable. I would wager that the gap is more along the lines of .125" if not more like .250"
the way my bearing flopped around, it is very conceivable that the rotor moves a 1/8"-1/4"
Oh, and lets look at where the rub is. On the front and the rear of the caliper. I am not sure if the radius of the caliper and the rotor are exactly the same, but I would also wager that the radius is almost the same if not exact. Why then would the scrubs only be on the front and the rear and not all the way across the radius??
Worn Bushings allowing the wheel to mover forward and backwards in relation to the Caliper.
Last edited by jhammons01; Apr 30, 2008 at 02:30 PM.
Le Mans Master
Joined: May 2006
Posts: 9,226
Likes: 9
From: Irvine Ca
Aight, My guess is off by a bit....but does that explain the radius of the Rotor OD and the Radius of the Caliper ID being different?
if they are the same or close...then why not have a scrub mark all the across the ID of the Caliper? Why only at the ends?
if they are the same or close...then why not have a scrub mark all the across the ID of the Caliper? Why only at the ends?
