Determine if your brake rotor can be resurfaced or needs replacement based on thickness measurements.
The original thickness of the rotor when new. Found stamped on the rotor or in the vehicle service manual. Common values: 20mm to 32mm.
mm
The manufacturer's minimum thickness. Below this the rotor must be replaced. Usually stamped on the rotor as "MIN TH" or found in service specs.
mm
The current thickness measured with a micrometer at the thinnest point. Measure at multiple points around the rotor for accuracy.
mm
Total material removed from both sides during resurfacing. Typical: 0.2-0.5mm per side (0.4-1.0mm total). Standard is about 0.25mm per side.
mm total
Results
Total Wear So Far-mm
Remaining Above Minimum-mm
Thickness After Resurface-mm
Can Be Resurfaced?-
Wear Life Used-%
References:
Brake rotors have a minimum discard thickness stamped on them. For resurfacing, the rotor must remain above minimum after machining. A safety margin of 0.5mm above minimum after resurfacing is recommended by most manufacturers.