Fig. 14.17. Front disc brake: 1 – brake disc; 2 – clamp; 3 – outer brake shoe; 4 – inner brake shoe; 5 – mounting plate; 6 – bleed nipple; 7 – bolt; 8 – support; 9 – spring mounting bracket
Always replace all the pads on one axle of the vehicle, even if only one pad is worn. Otherwise, this will result in different friction coefficients on the wheels, which will cause the vehicle to pull to one side during intensive braking. If the brake pads are to be re-installed, they must be marked before removal. During the first 500 km of driving, the structure of new brake pads changes under the influence of heat, so avoid frequent intensive braking during this time. Otherwise, the brake pads may quickly harden, which will worsen the braking performance. Carefully ensure that all spare parts of the brake system are original and approved for use (Fig. 14.17).
SEQUENCE OF WORKS
1. On a flat horizontal surface, loosen the front wheel mounting bolts, then lift the front of the car and secure it on supports. Remove the mounting bolts and remove the wheel.
2. Turn the steering wheel to make it easier to access the brake pads.
3. Using a narrow-blade screwdriver, remove the retaining spring clip from the caliper.
Fig. 14.18. Location of protective caps (1) covering guide pins (2) of front brake caliper mount
4. From the inside of the caliper, remove the protective caps 1 (Fig. 14.18) from both caliper guide pins.
5. Unscrew the guide pins 2.
6. Remove the brake caliper. When removing the caliper, the outer brake pad may remain in the brake pad guide.
7. Remove the outer brake pad from the caliper.
8. Raise the caliper and tie it to the front strut with soft wire. The caliper should not hang on the brake hose. The brake hose should not be stretched or twisted. If necessary, remove the brake hose from the shock absorber bracket.
9. Remove the inner brake pad from the caliper sliding piston.
10. Clean the brake shoe guides on the caliper with alcohol (never gasoline) and a rag or a hard toothbrush. Use a screwdriver to carefully remove the caked-on dust.
WARNING
Do not damage the protective sealing ring of the sliding piston.
11. Check the brake disc for grease, dirt and cracks.
12. When installing new brake pads, use a strong screwdriver or hammer handle to carefully press the sliding piston all the way into the caliper cylinder. Be careful not to damage the piston or protective cap.
WARNING
When the piston is pushed in, the brake fluid is forced out of the brake cylinder into the reservoir, so constantly monitor the fluid level in the reservoir and pump it out a little if necessary.
13. Insert the inner brake lining into the guides. Pre-lubricate the mating surfaces with consistent grease (copper paste), being careful not to get any on the disc and friction linings.
Fig. 14.19. Front disc brake caliper and brake pads: 1 – caliper; 2 – inner brake shoe; 3 – brake shoe guide; 4 – outer brake shoe; 5 – brake disc
14. Install the outer brake shoe onto the shoe guide (Fig. 14.19).
15. Reinstall the caliper and secure it with two guide pins to the brake shoe guide. Don't forget to install the protective caps.
Fig. 14.20. Fastening points of the spring mounting bracket in the brake shoe guide
16. Insert the spring retaining clip into the brake caliper. After the spring retaining clip is fixed in both holes, press it under the brake shoe guide, otherwise the wear of the outer brake shoe will not be adjusted automatically (Fig. 14.20).
17. Press the brake pedal several times to press the brake pads against the brake disc.
18. Check the brake fluid level in the reservoir. If necessary, remove the brake fluid with a syringe up to the "MIN" mark or add fresh brake fluid up to the "MAX" mark.
19. Install the wheels and lower the vehicle.
20. Carefully break in the new brake pads. On a secondary road, brake the car smoothly several times from 100 km/h to 50 km/h. Allow the brakes to cool between braking.
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