To ensure uniform braking of both wheels, both brake discs must have the same ground surfaces with the same degree of roughness.
Therefore, be sure to replace both brake discs of one axle at the same time.
Attention! When installing new brake discs or after grinding them, new brake pads must also be installed.
Rusted brake discs produce an effect similar to that of a scraper when braking. This effect is not eliminated even with prolonged braking. In such cases, the brake discs must be replaced.
Removing
Attention! Jacking up the vehicle carries the risk of injury. It is recommended that you first familiarize yourself with the safety measures when installing the car on jack stands.
1. Mark the direction of rotation of the wheel with an arrow on the sidewall of the tire and loosen the wheel bolts.
2. Jack up the car, jack it up and remove the wheels.
3. Remove the brake pads and caliper.
4. Block the bore of the wheel brake cylinder with a piece of wood between the piston and caliper to prevent the piston from slipping out.
5. Secure the removed caliper with wire to the body or to the suspension spring, being careful not to twist or stretch the brake hose.
6. Remove the locking bolt that secures the brake disc.
Attention! The brake disc must not be knocked off the hub with a hammer if it is rusted. Instead, it is recommended to use a rust converter. If the disc cannot be removed otherwise than by knocking it down with a hammer, then it is recommended to replace both the brake disc and the hub after that. Brake discs should also be replaced with new ones if an appropriate puller has been used to remove them.
Installation
In the workshop, the brake discs can be checked for runout. Permissible disc runout 0.05 mm. Permissible deviation in disc thickness 0.01 mm.
7. Measure the brake disc thickness.
8. Remove, if necessary, rust from the brake disc flange and from the hub.
9. Clean new brake discs from protective varnish with a nitro thinner.
10. Install the brake disc on the hub and secure it with a bolt with a tightening torque of 4 Nm.
11. Install the brake pads and bolt the caliper.
12. Brake mechanisms of the rear wheels. Adjust the parking brake.
Attention! If the brake hose was disconnected, then connect it and remove air from the brake system, see the relevant chapter.
13. Establish wheels according to the marks put at removal.
14. Screw in bolts of fastening of wheels and lower the car.
15. Tighten the wheel bolts in a cross pattern to 120 Nm.
Attention! Squeeze out a few times a brake pedal against the stop, the strong resistance to pressing is not felt yet.
16. Check the brake fluid level in the expansion tank. If necessary, add fluid up to the maximum mark.
Attention! Make sure that:
- A) brake hoses are securely connected,
- b) brake hoses are fixed in holders,
- V) brake bleeders are screwed on,
- G) there is enough brake fluid in the expansion tank.
17. Perform a brake leak test by starting the engine.
To do this, depress the brake pedal with a force of 200-300 N (20-30kg) and hold it for about 10 seconds. The pressure in the system and, accordingly, the resistance of the brake pedal, should not decrease. Check all connections for tightness.
18. Carefully run in new brake pads. To do this, slow down several times, bringing the speed from about 80 km / h to 40 km / h and lightly pressing the brake pedal. Let the brakes cool down in between.
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