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Home >> Cadillac >> 1997 >> Catera V6-3.0L VIN R >> Repair and Diagnosis >> Brakes and Traction Control >> Disc Brake System >> Testing and Inspection >> Diagnostic Information and Procedures >> Brake Rotor Lateral Runout Check >> Front Rotor

Front Rotor

^ Tools Required
- J 80001 Dial Indicator Set

Lateral runout is the movement of the rotor braking surface from side to side as it rotates on the front bearing hub. this could be described as ROTOR WOBBLE. The movement of the rotor from side to side in the lateral plane knocks the pads away from the rotor. This cause the piston to be driven back into its bore. This can result in excessive pedal travel and possible vibrations during braking.
1. Remove the front brake caliper. Refer to Brake Caliper Replacement (Front).





2. Install the wheel bolt (2) to rotor opposite rotor set screw (1)
3. Fasten J 80001 to the steering knuckle so that the indicator button contacts the rotor surface about 13 mm (0.5 inch) from the outer edge.
4. Zero J 80001.





5. Move the rotor one complete revolution and observe Total Indicted Runout (TIR). TIR should not be more than 0.10 mm (0.004 inch). A front brake motor that does not meet the lateral runout specification should be resurfaced or replaced as necessary.
6. Install the front brake caliper. Refer to Brake Caliper Replacement (Front).

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