Warped Rotors
06-13-2009, 01:14 AM
#1
Burning Brakes
Thread Starter
Warped Rotors
Hey guys,
After my last track event I have noticed a vibration when braking. I wouldn't call it severe but definitely felt through the brake pedal. I actually first noticed this on my last session at the event. I was running at Buttonwillow in So cal, which is hard on brakes. My first thought was that I have warped my rotors.
I checked them for runout tonight and found the drivers right rotor to have about 0.005" runout and the passenger side about 0.003 to 0.004". I thought I might see more than this, what is considered normal or acceptable?
I should note that I change my pads when I go to the track and change them back to street pads. The rotors I leave on the car. The rotors are DBA4000 and used on a C6Z06. Only my second event with these rotors. Never had a problem with my stock ones, go figure. I run Hoosier R6 tires so the brakes are worked pretty hard.
Is it OK to turn these rotors to take out the taper? I know removing metal is not ideal buy all I need to do is remove 0.006" or so per side.
Thoughts?
After my last track event I have noticed a vibration when braking. I wouldn't call it severe but definitely felt through the brake pedal. I actually first noticed this on my last session at the event. I was running at Buttonwillow in So cal, which is hard on brakes. My first thought was that I have warped my rotors.
I checked them for runout tonight and found the drivers right rotor to have about 0.005" runout and the passenger side about 0.003 to 0.004". I thought I might see more than this, what is considered normal or acceptable?
I should note that I change my pads when I go to the track and change them back to street pads. The rotors I leave on the car. The rotors are DBA4000 and used on a C6Z06. Only my second event with these rotors. Never had a problem with my stock ones, go figure. I run Hoosier R6 tires so the brakes are worked pretty hard.
Is it OK to turn these rotors to take out the taper? I know removing metal is not ideal buy all I need to do is remove 0.006" or so per side.
Thoughts?
06-13-2009, 06:43 AM
#3
Instructor
Member Since: Apr 2009
Location: Mechanicsburg PA
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Rotors seldom warp. The pulsing you are feeling is from various pad compounds that are embedded into your rotor. Yes, you can turn them...it will remove the pad deposits. But, based on rotor composition, you may see the same issue in the near future.
What street/track pads to you run? They don't seem to be compatible.
Don
What street/track pads to you run? They don't seem to be compatible.
Don
06-13-2009, 07:15 AM
#4
Melting Slicks
Member Since: Sep 2004
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Rotors seldom warp. The pulsing you are feeling is from various pad compounds that are embedded into your rotor. Yes, you can turn them...it will remove the pad deposits. But, based on rotor composition, you may see the same issue in the near future.
What street/track pads to you run? They don't seem to be compatible.
Don
What street/track pads to you run? They don't seem to be compatible.
Don
I'll bet you the track pads he's using are from Carbotech. Switch to something else and the deposit problem will be minimized.
Frank Gonzalez
06-13-2009, 07:23 AM
#5
Safety Car
You more than likely have compound build up. Take a 40-grit sander to them and see what happens. Clean them with brake clean until your paper towel doesn't pick up any black.
Richard
Richard
06-13-2009, 10:30 AM
#6
Racer
Member Since: Mar 2004
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Just to support what everyone else is already saying: http://www.stoptech.com/tech_info/wp...rakedisk.shtml
- Max
- Max
06-13-2009, 10:45 AM
#8
Race Director
if they are indeed warped, there is a good chance there was debris on the flange when the rotors were mounted, and they were forced out of round by this.
Either way, as long as it isn't so sever that it causes the pads to "knock back" into the calipers, I'd just keep trucking!
Either way, as long as it isn't so sever that it causes the pads to "knock back" into the calipers, I'd just keep trucking!
06-13-2009, 01:13 PM
#9
Burning Brakes
Thread Starter
Again, does anyone know what is considered abnormal runout for a rotor? I posted what I am measuring above.
06-13-2009, 01:15 PM
#10
Burning Brakes
Thread Starter
if they are indeed warped, there is a good chance there was debris on the flange when the rotors were mounted, and they were forced out of round by this.
Either way, as long as it isn't so sever that it causes the pads to "knock back" into the calipers, I'd just keep trucking!
Either way, as long as it isn't so sever that it causes the pads to "knock back" into the calipers, I'd just keep trucking!
I mounted the rotors when they were brand new and I have not taken them on and off since.
06-13-2009, 01:16 PM
#11
Burning Brakes
Thread Starter
Lucky for me I work for a company that makes machine tools and have a couple of machinists that work for me so this will not be a problem if I choose to turn them.
