C0135
ChassisBrake Systemhigh severityBrake Rotor Temperature Excessive
What C0135 Means
The brake rotor temperature sensor or calculation indicates brake temperature exceeds safe limits.
Symptoms
- Brake fade warning
- Reduced braking performance
- Brake smell
- Brake warning light
- ABS intervention increased
Common Causes
- Aggressive driving downhill
- Seized brake caliper
- Dragging brake pad
- Brake fluid boiling
- Undersized brakes for vehicle load
Diagnostic Steps
- Check all four rotors for discoloration indicating overheating
- Inspect calipers for seized pistons or slides
- Check brake pad contact pattern
- Verify brake fluid boiling point with refractometer
- Check for dragging brakes by spinning wheels
Where to start: Identify and correct the cause of overheating. Replace fluid if boiling point is low. Service seized calipers.
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