Quick Overview
- This blog post provides a comprehensive guide on how to check brake rotor runout to ensure your vehicle’s braking system is operating at its best.
- It is recommended to check brake rotor runout every 10,000 to 15,000 miles or as part of regular brake maintenance.
- While it is possible to resurface brake rotors yourself, it is generally recommended to leave it to a qualified mechanic for optimal results and safety.
Brake rotors are an essential component of any vehicle’s braking system, responsible for slowing down and stopping the car. However, over time, brake rotors can become warped or develop runout, which can significantly impact braking performance and safety. This blog post provides a comprehensive guide on how to check brake rotor runout to ensure your vehicle’s braking system is operating at its best.
What is Brake Rotor Runout?
Brake rotor runout refers to the unevenness or wobble of the brake rotor’s surface. This can occur due to various factors, such as excessive heat, improper installation, or uneven wear. Runout can cause vibrations, pulsations, and reduced braking efficiency.
Symptoms of Brake Rotor Runout
The following symptoms may indicate that your brake rotors have runout:
- Vibrations or pulsations in the steering wheel or brake pedal when braking
- A grinding or squealing noise when braking
- Uneven brake pad wear
- Reduced braking performance
Tools and Equipment Required
To check brake rotor runout, you will need the following tools and equipment:
- Dial indicator
- Magnetic base
- Feeler gauge
- Gloves
- Safety glasses
Step-by-Step Guide to Checking Brake Rotor Runout
1. Safety First
Before starting any work, ensure your vehicle is parked on a level surface and the parking brake is engaged. Wear gloves and safety glasses for protection.
2. Remove the Wheel
Use a lug wrench to loosen the lug nuts on the wheel you want to inspect. Lift the vehicle using a jack and remove the wheel.
3. Mount the Dial Indicator
Attach the magnetic base to the steering knuckle or caliper bracket. Position the dial indicator so that the tip rests on the outer edge of the brake rotor.
4. Zero the Dial Indicator
Gently rotate the rotor by hand and zero the dial indicator. This will establish the reference point for measuring runout.
5. Measure Runout
Slowly rotate the rotor again while observing the dial indicator. The runout will be displayed on the dial as the indicator tip moves up and down.
6. Determine Acceptable Runout
Most vehicle manufacturers specify an acceptable runout tolerance for their brake rotors. Refer to your vehicle’s service manual or consult a qualified mechanic for the specific tolerance.
7. Inspect for Other Issues
If the runout exceeds the acceptable tolerance, inspect the brake pads, calipers, and other components for any visible damage or wear.
Fixing Brake Rotor Runout
If the brake rotor runout is within the acceptable tolerance, no further action is necessary. However, if the runout is excessive, it may need to be corrected. This can be done through resurfacing or replacing the brake rotor.
Final Note
Checking brake rotor runout is a crucial step in maintaining your vehicle’s braking system. By following the steps outlined in this guide, you can ensure that your brake rotors are functioning properly and providing optimal braking performance. Remember to check your brake rotors regularly and address any runout issues promptly to ensure the safety and reliability of your vehicle.
Common Questions and Answers
1. What causes brake rotor runout?
Brake rotor runout can be caused by excessive heat, improper installation, uneven wear, or damage.
2. How often should I check brake rotor runout?
It is recommended to check brake rotor runout every 10,000 to 15,000 miles or as part of regular brake maintenance.
3. Can I fix brake rotor runout myself?
While it is possible to resurface brake rotors yourself, it is generally recommended to leave it to a qualified mechanic for optimal results and safety.
