Rotor Run out...How do you fix?
Thread Starter
Melting Slicks
Joined: Jan 2003
Posts: 2,713
Likes: 31
From: Shreveport LA
LA Events Coordinator
Rotor Run out...How do you fix?
I've searched the forum and can't seem to located a thread/post on how to fix the run out on the rotor.....So how is it fixed? I have a chirping noise at low speeds and with the windows down, I can hear it really well....and it stops when I just touch the brakes. Either that or I have a bird camping out in my Vert and he knows when I touch the brakes....
Any help will be greatly appreaciated.
Any help will be greatly appreaciated.
Team Owner
Joined: Jan 2006
Posts: 37,637
Likes: 3,117
From: Crossville TN
If your brake pads have a 'wear indicator' on them, 'chirping' is the sound they make when the pads are getting worn down pretty far. Pull the wheel and check pad thickness. If you have plenty of pad and that little 'scraper' is still hitting the rotor when applied, just bend it back a bit.
With out of round rotors, the 'chirping' happens when you apply the brakes.
With out of round rotors, the 'chirping' happens when you apply the brakes.
Race Director
Joined: May 2005
Posts: 10,674
Likes: 122
From: Millington Illinois
St. Jude Donor '08-'09
Le Mans Master
Joined: Jan 2000
Posts: 8,918
Likes: 27
From: New Hill NC
If your brake pads have a 'wear indicator' on them, 'chirping' is the sound they make when the pads are getting worn down pretty far. Pull the wheel and check pad thickness. If you have plenty of pad and that little 'scraper' is still hitting the rotor when applied, just bend it back a bit.
With out of round rotors, the 'chirping' happens when you apply the brakes.
With out of round rotors, the 'chirping' happens when you apply the brakes.
Runnout can cause chirping and is a common cause. The pad works back and forth on the pin and sings like a bird. Sort of like friction turkey call. Hey, an idea, use it for turkey hunting. A slight touch of the pedal quiets it immediately.
As for fixes, you haven't looked hard, because there must be hundreds of discussions on the subject. There are many fixes ranging from machining together like original or shimming.
Last edited by wombvette; Jan 22, 2012 at 01:20 PM.
Drifting
Joined: May 2005
Posts: 1,258
Likes: 38
From: springtown Texas
Drifting
Joined: Jul 2008
Posts: 1,483
Likes: 459
From: Lititz PA
I have only fixed the rear rotor runout so far.
The first thing I did was mount the rotor on the spindle. I used some Heavy duty Grade 8 washers on the studs. Then evenly torqued the lug nuts just like I would if I were mounting the wheel.
Then I used a magnetic base dial indicator to measure the runout near the outside diameter of the rotor. I marked the rotor face low spot with a felt pen.
I removed the rotor and installed shims over 3 wheel studs. I used regular scissors to cut out the proper thickness shims from a stainless steel shim assortment that I bought at my local Ace Hardware store.
Then I replaced the rotor, torqued the lug nuts, and checked the runout again. It took awhile, but I got the rear runout to be less than .002.
John
The first thing I did was mount the rotor on the spindle. I used some Heavy duty Grade 8 washers on the studs. Then evenly torqued the lug nuts just like I would if I were mounting the wheel.
Then I used a magnetic base dial indicator to measure the runout near the outside diameter of the rotor. I marked the rotor face low spot with a felt pen.
I removed the rotor and installed shims over 3 wheel studs. I used regular scissors to cut out the proper thickness shims from a stainless steel shim assortment that I bought at my local Ace Hardware store.
Then I replaced the rotor, torqued the lug nuts, and checked the runout again. It took awhile, but I got the rear runout to be less than .002.
John
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