Removal
Note: Brake discs cannot be ground. If they are significantly worn or have deep scratches, replace the discs.
Note: When replacing brake discs, replace them together with the brake pads.
Place the vehicle on a two-post lift.
Unlock the steering wheel.
Remove the front wheels.
Fig. 6.66. Removing the shoe guide fastening: 1 – mounting bolts
Remove the two bolts securing the brake shoe guide (Fig. 6.66).
Hang the brake caliper assembly from the brake shoe guide.
Measuring the thickness of the brake disc
Install a micrometer to measure the thickness of the brake disc (Fig. 6.67).
Fig. 6.67. Installing a micrometer to measure the thickness of the brake disc: 1 – micrometer
Fig. 6.68. Brake disc thickness measurement points
Measure the thickness of the brake disc in order at four points shown in Figure 6.68, around the circumference (at 90° intervals).
Standard thickness of front brake discs: 22 mm (cars with K4J engine) and 24 mm (cars with engines K4M, F4R).
If the thickness is less than specified, replace the discs.
Remove the brake shoe guide.
Fig. 6.69. Removing the brake disc mount: 1 – mounting bolts
Unscrew the two screws securing the brake disc (Fig. 6.69).
Remove the brake disc.
Examination
Check the inner cylinder walls for corrosion, wear and damage. Replace the cylinder body if necessary. Minor defects caused by corrosion or foreign particles can be removed by sanding the surface with fine emery cloth. Check the piston surface, guide pin and its boot, and brake disc surface for corrosion, wear and damage. Replace the relevant component if necessary.
Installation
Clean the shoe guides and brackets.
Installation is carried out in the reverse order of removal.
Tighten to the specified torque:
- brake disc mounting screws (15 Nm);
- shoe guide mounting bolts (105 Nm).
Before installation, apply FRENEBLOC to the threads of the shoe guide mounting bolts (or its equivalent).
Install the wheels.
Tighten the wheel mounting bolts to the specified torque of 105 N·m.