Note: The brake pads are equipped with wear indicators which, when touching the brake disc, when the brake lining thickness reaches less than 2 mm, produce a squealing sound during braking, warning the driver of the need for urgent replacement of the brake pads (Fig. 15.18).
Fig. 15.18. Brake pad with wear indicator
1. Check the thickness of the friction linings of the brake pads through a special inspection hole in the caliper (Fig. 15.19).
Fig. 15.19. Checking the thickness of the brake pad linings through the inspection hole in the caliper
Thickness of brake pads
- nominal: 10 mm
- minimum allowable: 2.0 mm
Warnings
- (1) Be sure to replace all the pads on one axle of the vehicle, even if only one pad is worn.
- (2) If there is a significant difference between the thickness of the left and right brake pads, check the condition of the wheel cylinder piston and guide pins.
2. Unscrew the lower guide pin mounting bolt from the caliper, lift the caliper up and secure it to the front suspension strut with soft wire (Fig. 15.20).
Fig. 15.20. Location of the lower guide pin mounting bolt
Warning: Do not wipe off the special grease from the surface of the guide pin or allow it to become dirty.
3. Remove the brake shoe with wear indicator, the brake shoe and outer lining (Fig. 15.21).
Fig. 15.21. Front brake pads: 1 - brake shoe with wear indicator assembly; 2 - brake shoe; 3 - outer gasket
4. To determine the rotational resistance force after installing new brake pads, measure the rotational resistance of the wheel hub bearing without brake pads.
5. Install the brake pads and caliper, then measure the rotating resistance force.