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Lateral Runout

Adjust wheel bearings until all endplay is eliminated. Attach a dial indicator to front suspension so that pointer contacts face of rotor approximately one inch from rotor edge. Set gauge to zero, then turn rotor through one complete revolution noting gauge. See Rotor Specifications for maximum allowable runout.

Fig 1: CHECKING LATERAL RUNOUT (TYPICAL)
G09336212Courtesy of GENERAL MOTORS COMPANY