3000GT V6-3.0L SOHC (1998)
Brake Rotor/Disc: Testing and Inspection
Front Disc
FRONT BRAKE DISC RUN-OUT CHECK
1. Remove the front brake assembly; and support it with a wire, etc.
2. Inspect the disc surface for grooves, cracks and rust. Clean the disc thoroughly and remove all rust.
3. Place a dial gauge approximately 5 mm (0.2 inch) from the outer circumference of the brake disc, and measure the run-out of the disc.
Limit: 0.05 mm (0.002 inch) or less
NOTE: Secure the disc to the hub with wheel nuts.
FRONT BRAKE DISC THICKNESS CHECK
1. Using a micrometer, measure disc thickness at eight positions, approximately 45° apart and 10 mm (0.39 inch) in from the outer edge of the disc.
Standard value:
<FWD> 24.0 mm (0.94 inch)
<AWD> 30.0 mm (1.18 inch)
Limit:
<FWD> 22.4 mm (0.88 inch)
<AWD> 28.4 mm (1.12 inch)
Thickness variation (At least 8 positions)
The difference between any thickness measurement should not be more than 0.015 mm (0.0006 inch).
2. If the disc is beyond the limits for thickness, remove it and install a new one.
If thickness variation exceeds the specification, replace the disc or turn rotor on the car type brake lathe ("Accuturn-8750" or equivalent). Be sure
to follow the exact brake lathe manufacturer instructions.
