How to fix warped brake rotors.
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 Published On Mar 18, 2022

You can find tools used in this video here:
Dial indicator: https://amzn.to/3JDxizP
Torque wrench: https://amzn.to/3weNmUJ
Brake Shims: https://amzn.to/3IktrGb
Brake Rotors: https://amzn.to/3IktRfJ
(these are Amazon affiliate links)


How to fix warped brake rotors.
Recently I started having an issue with my car. The steering wheel would start shaking and vibrating, and I felt pulsation in the brake pedal when applying brakes at higher speeds. I’ve also got “Check Brake System” warning indicator light on the dashboard. These are the symptoms of warped brake rotors, and to properly diagnose the problem, we would need to measure brake rotors runout.

The most common symptoms and causes of warped brake rotors:
- Excessive vibration when applying brakes, especially at high speeds
- Vibration and shaking in the steering wheel when braking.
- Brake pedal pulsation when applying brakes
- In some cases wheels speed sensors may detect abnormal measurements and throw “Check Brake System” “Check ABS system” or “Check Traction Control System” warning indicator lights on the dashboard.

The most common causes of warped rotors could be:
poor quality of brake rotors or brake pads
- uneven brake rotor wear
- seized brake calipers
- overheating
- over-tightening the wheel lug nuts or not tightening them in a star pattern.

There are several ways to correct excessive run out:
- If runout is more than 0.002, but less than 0.009 inch – it might be possible to correct it using correction palates or shims.
- Replace the wheel bearing & hub assembly if it has excessive runout or bearing looseness
- If the bearing hub runout is normal, you can try to change the installation position of the brake rotor. Combine the highest point on the rotor with the lowest point on the hub (or vice versa), and it may decrease overall runout.
- Resurface the rotor if it still has enough thickness. For example, according to the repair manual minimum rotor thickness for my car is 27 mm. I used a digital micrometer to measure the thickness and it was a little over 29 mm. It was acceptable and I was able to resurface my rotors for just $12 a piece at my local auto-parts store. After that the runout decreased from 0.004 to 0.002 inch.
- Replace brake rotors if you prefer, or if rotor thickness is no longer acceptable for resurfacing.
After you are finished, re-install everything in the reverse order of removal.
Pump the brake pedal and make sure brakes are working properly before driving.

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