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Home >> GMC >> 1990 >> Forward Control 7.4 N, Automatic, 475/M40 >> Repair and Diagnosis >> Brakes >> Mechanical - Hydraulic >> DISC & DRUM (C, G, K, P, R & V Series) >> Rotor Servicing >> Parallelism

Rotor Servicing: Parallelism

Check thickness of rotor at 4 or more points around circumference of rotor. Make all measurements at same distance from edge of rotor. If thickness variation is excessive, refinish or replace rotor as necessary.