Symptoms
- Vibration or pulsation when braking, especially at higher speeds
- Steering wheel or brake pedal shakes
- May have a slight noise along with the vibration
Likely causes
- CommonHeat-induced warping from hard or prolonged brakingRepeated heavy braking, like on mountain descents, can distort the rotor surface.
- CommonUneven pad material deposits on the rotor (sometimes called 'warping' but really a deposit issue)Can mimic warping symptoms without the rotor actually being physically bent.
- PossibleRotor thickness variation from normal wear over timeRotors wear unevenly over tens of thousands of miles.
- Less commonRotor installed with uneven lug nut torque, causing distortionOvertightening or uneven torque during a wheel or brake job can warp a rotor.
What to do
- Note if the vibration is worse at higher speeds or specifically during braking.
- Avoid long, hard braking (like descending a mountain in high gear) until this is addressed, since it worsens rotor damage.
- Have a mechanic measure the rotor's thickness variation and runout with proper tools, since eyeballing usually isn't accurate enough.
- Have rotors resurfaced if they're within the minimum thickness spec, or replaced if not.
- Have pads replaced at the same time, since old pads can carry uneven deposits that cause the same symptoms.
- Ask about proper lug nut torque sequence for future wheel or brake service to avoid recurring warping.
Tools and parts
Brake rotorsSearch: “brake rotors for your car make and model”
Brake pads (axle set)Search: “brake pads for your car make and model”
When to call a pro
See a mechanic to measure the rotors properly, since resurfacing vs. replacement depends on exact thickness measurements.
Safety
Generally low risk
Generally low risk for a careful person. Stop if anything looks different from what this guide describes.