Checking the brake disc and brake components (Mazda 6 GG)

Check the inner cylinder walls for corrosion, wear and damage. Replace the cylinder body if necessary. Remove minor defects caused by corrosion or foreign particles by sanding the surface with fine emery cloth. Check the piston surface, guide pin, guide pin boot and brake disc surface for corrosion, wear and damage. Replace the relevant component if necessary.



Mark the wheel hub bolt and brake disc before removal for subsequent installation (Fig. 6.35).

Unscrew the mounting bolt and remove the brake hose.

Remove the guide pin cover and the pin itself.



Using a micrometer, measure the thickness of the brake disc (Fig. 6.36).

• Standard thickness: 26 mm.
• Minimum thickness: 24 mm.

Replace the disc if the disc thickness is less than the minimum allowable.

Secure the brake disc to the wheel hub with wheel nuts (in two or more places).



Check the runout with an indicator (Fig. 6.37).

• Measuring point: 10 mm from the outer edge of the disc.
• Maximum runout: 0.05mm or less.

Caution: Before taking measurements, make sure that the axial play is 0 mm.

If the runout is significant, find the point of minimum runout by successively shifting the installation position of the brake disc on the hub by one hole.

Remove any rust or dirt from the contact surface of the brake disc and wheel hub.

Install the brake disc and align the marks made before removal.