Note. Brake discs cannot be sanded. In case of significant wear or deep scratches, the discs must be replaced.
When replacing the brake discs, also replace the brake pads.
Place the car on a lift.
Unlock the steering wheel. Remove the front wheels.
Remove the two fixing screws (1) guide pad.
Hang the caliper assembly from the shoe guide.
Measuring the thickness of the brake disc
Install micrometer (1) for measuring the thickness of the brake disc. Measure the thickness of the brake disc in order at the four points shown in the figure along the circumference (through 90°).
Standard front brake disc thickness: 24-26mm (depending on disc diameter).
If the thickness is less than specified, replace the discs.
Remove the shoe guide.
Remove two screws (1) brake disc mounting.
Remove the brake disc.
Examination
Check for corrosion, wear and damage on the inner walls of the cylinder. Replace cylinder body if necessary. Minor imperfections caused by corrosion or foreign particles can be removed by sanding the surface with fine emery cloth. Replace cylinder body if necessary. Check for wear, cracks and damage. If necessary, replace the corresponding component. Check for corrosion, wear and damage on the piston surface. If necessary, replace the corresponding component. Check for corrosion, wear and damage on the guide pin and guide pin boot. If necessary, replace the corresponding component. Check for uneven wear, cracks and severe damage to the surface of the brake disc.
Installation
Clean the pad guides and calipers.
Installation is made in an order, the return to removal.
Torque tighten:
- brake disc screws (15 Nm);
- guide rail mounting bolts (105 Nm).
Apply FRENEBLOC to the threads of the guide shoe mounting bolts before installation (or its equivalent).
Install wheels.