Contents: Removal ↳ Installations ↳
Removal
The position of the front wheels on the capitals is marked with paint. Thanks to this, the balanced wheel can be installed again in the previous position. When loosening the wheel nuts, the car should stand on its wheels. The front part of the car is supported on the stand, goats and front wheels.
Using a screwdriver, press the retaining clip away from the caliper.
Remove the protective caps from both guide pins. Use a 7 mm Allen key to unscrew the guide pins of the caliper.
Disconnect the brake pad wear indicator sensor connector.
Remove the piston housing from the brake shoe guide.
The brake pads have been removed from the piston housing.
Caution. Do not swap brake pads from the right wheel to the left. Changing the location of the pads may result in uneven braking action. Brake pads of one axle must be replaced only as a set. If disc brake pads are to be reinstalled, their location must be marked before removal.
Installations
Caution: When the brake pads are removed, do not press the brake pedal, otherwise the piston will be pushed out of the housing.
Clean the guide surfaces or the corresponding pad locations in the housing shaft with a suitable soft metal brush or wipe with a cloth soaked in alcohol. Do not use solutions containing mineral oils or tools with sharp edges.
Before installing the pads, check the brake discs with your fingers to make sure there are no dents. Discs with dents must be replaced.
Measure the thickness of the brake discs, see p. 114.
Check the dust seal and caps for cracks. Replace a damaged seal immediately, as penetrating dirt will quickly damage the caliper's seal. To do this, the brake caliper must be disassembled (at a service station).
The brake cylinder piston is pushed back into the caliper cylinder using a return device. A hardwood rod (hammer handle) can also be used for this purpose, but care must be taken to ensure that the piston is not skewed and that the piston and dust seal surfaces are not damaged.
Note: When installing the piston into the cylinder, the brake fluid from the brake cylinder is squeezed into the expansion tank. Monitor the fluid level in the tank and, if necessary, suck out excess fluid with a siphon.
To suck out the fluid, use a plastic bottle that has only been in contact with brake fluid before. Do not use bottles intended for drinking liquids! Brake fluid is poisonous and should never be sucked out by mouth through a hose. Suck out the fluid with a siphon. After replacing the brake pads, the brake fluid level in the expansion tank should also not exceed the MAX mark, since the fluid expands when heated. Brake fluid leaking from the tank gets under the master brake cylinder, destroys the varnish coating and leads to corrosion.
Note: If the brake pads are heavily worn, check the ease of movement of the piston. To do this, insert a wooden block into the caliper and ask an assistant to slowly press the brake pedal. The piston should be easily pushed out and back into the wheel cylinder of the caliper. When checking, another caliper should be installed in its place. Make sure that the piston is not pushed out of the caliper completely. If the piston moves heavily, the caliper must be repaired (at a service station).
Insert the inner brake shoe together with the retaining spring into the piston.
Remove the protective paper from the outer brake shoe and insert the shoe into the housing.
Insert the piston body into the brake shoe guide.
Route the connecting wire of the brake pad wear indicator sensor so as to prevent it from being rubbed by the brake disc. Connect the plug connector of the brake pad wear indicator sensor.
Place the guide pins and tighten to 25 Nm. Install protective caps on the guide pins
Insert the retaining bracket into the brake caliper.
Tighten the front wheels with nuts in accordance with the marks made before removal. Lower the car and tighten the wheel nuts crosswise to a torque of 100 Nm.
Caution: Press the brake pedal hard repeatedly with the vehicle stationary until you feel strong resistance.
Check the brake fluid level in the expansion tank and, if necessary, top up the tank to the MAX mark.
Carefully work in new brake pads by repeatedly braking the car from 80 km/h to 40 km/h by lightly pressing the brake pedal. Allow the brakes to cool down a little between braking operations.
Attention: On a section of the road up to 200 km long, there should be no sudden braking before coming to a complete stop.