Cutlass V6-191 3.1L VIN M SFI (1998)
Brake Rotor/Disc: Testing and Inspection
Brake Rotor Thickness Variation Check
Check thickness variation by measuring the rotor thickness at four or more points around the circumference of the rotor. Use a micrometer calibrated in
ten-thousands of an inch. Make all measurements at the same distance in from the edge of the rotor.
A rotor that varies in thickness by more than 0.013 mm (0.0005 in) may cause pedal pulsation and/or front end vibration during brake applications. A
rotor that does not meet these specifications should be refinished to specifications or replaced.