Attention! If the brake discs need to be replaced or reground, new brake pads must be installed at the same time.
Removing
1. Mark with paint the position of the wheels relative to the hubs. This will allow the assembly to install the balanced wheels in their original position. Loosen the wheel bolts before jacking up the vehicle. Raise the car, put it on stands and remove the wheels.
Attention! The operation of lifting and placing the vehicle on stands is dangerous! Therefore, before carrying out the operation, read Section Jacking and towing Introduction to leadership.
2. Remove the brake pads, refer to the appropriate section.
3. Remove the caliper, refer to the relevant section.
Note. The brake hose does not need to be removed.
4. Suspend the caliper so that the brake hose is not twisted or stretched.
5. To prevent the brake piston from slipping, clamp a block of wood between the piston and caliper.
6. Rear wheel brake: Fully release the parking brake. Turn back the adjusting device of a parking drum brake. To do this, insert a screwdriver through the threaded hole for the wheel bolts. Right wheel: Turn the adjusting gear with a screwdriver (1) down up. Left wheel: Turn the adjusting gear with a screwdriver (1) top down.
7. Remove the lock screw (1) and remove the brake disc (2) from the hub.
Note. Remove a firmly seated brake disc from the hub with light blows with a plastic hammer or with a puller.
Installation
1. If there is rust on the brake disc flange and front wheel hub, remove them.
2. New brake discs: Remove the protective coating of the disc with a rag and thinner.
3. Rear wheel brake: If a used disc is being installed, wipe the surface of the parking brake pad and visually inspect it. Check the ease of movement of the expanding lock of the brake pads of the parking brake.
4. Install the brake disc on the hub and secure with a new self-locking bolt. Tighten the lock screw to 10Nm.
5. Rear wheel brake: Adjust the brake mechanism. To do this, insert a screwdriver through the threaded hole of the wheel bolts. Right wheel: Turn the adjusting gear with a screwdriver (1) top down. Left wheel: Turn the adjusting gear from the bottom up with a screwdriver. Rotate the adjusting gear until the brake pads are against the disc and the rear wheel stops spinning. After that, slowly turn the adjusting gear back so that the wheel can rotate freely. Make sure that the gear on the right and on the left side of the wheel is turned back by the same number of teeth.
6. Reinstall the caliper, refer to the appropriate section.
7. Install the brake shoe, refer to the appropriate section.
8. Reinstall the wheels so that the marks made during removal match. Pre-lubricate with a thin layer of bearing grease the centering belt of the wheel disk on the hub. Do not grease wheel bolts. Replace rusty bolts. Wrap bolts. Lower the car onto the wheels and tighten the bolts crosswise to 110Nm.
Attention! Check that the front brake hose is not touching the wheel at maximum steering angle.
Several times, firmly press the brake pedal until a noticeable resistance is felt. Thus, the brake pads are adjacent to the disc and occupy their working position.
9. Rear wheel brake: Apply the parking brake several times and check its adjustment. If necessary, adjust the brake, refer to Section Brake system checks. Parking brake adjustment.
10. Carefully break in new brake pads. To do this, brake the car several times from a speed of 80 km/h to a speed of 40 km/h, lightly pressing the brake pedal. Let the brake cool down between braking. For the first 200 km of driving, do not apply heavy braking of the car unnecessarily.
Attention! After installing new brake pads, they must be run in. At the same time, be sure to keep an eye on the traffic situation. When driving on the highway, avoid unnecessary braking for the first 200 km.
Check reliability:
- Are the brake lines secured?
- Is the brake hose fixed in the holder?
- Are the bleed fittings tight?
- Has sufficient brake fluid been added?
- With the engine running, check for leaks. To do this, press the brake pedal with a force of 200-300 N (20-30 kg) within 10 s. The pedal must not loosen. Check all connections for tightness.