Quick Disc Rotor problem identification guide

This guide is not designed to replace proper inspection by qualified professionals! We are not responsible for any misdiagnosis occurring as a result of this guide.

Thin rotors

Thin rotors are sign of worn rotors and should be replaced soon, if the rotor width measured is below minimum thickness then they require replacement immediately.

Uneven wear

Look across the surface for any indentations or creases, in this scenario the rotors may be machined if their is sufficient thickness or can be replaced. It is important to find the issue causing the uneven wear, possibly stuck brake calipers or rotors haven’t been tightened correctly.

Cracks

Inspect the disc rotor surface for any visible cracks, this can be caused by excessive heat or rapid temperature changes e.g. Washing rotors after heavy use which causes the cracks to appear. Be sure to replace the rotors, light cracks can worsen overtime with use.

Contaminated surface

Check the braking surface for anything such oils, grease or brake-fluids. Contaminated surfaces will greatly reduce the braking performance of affected disc rotors. If any contaminates are found remove the disc rotor from vehicle and clean before refitting.

Scoring

If there is deep scratches running across the disc rotor surface, remove the disc rotor and brake-pad and check if any foreign materials are lodged between the braking surface. NOTE – If when you apply the brakes and braking performance is normal, then this simply may be cosmetic due to the brake-pad used, if unsure check it inspected by a qualified professional.

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