Withdrawal
Mark the position of the front wheels on the hubs so that you can then reinstall the balanced wheels in their original position. Loosen the wheel bolts with the vehicle on the ground. Raise and support the vehicle in front and remove the front wheels.
Attention: If the pads are to be used further, they must be marked when removed. Replacing the pads from the right to the left wheel and vice versa is not allowed. The result of such a replacement can be uneven braking. When replacing, use only original pads and always replace the pads on both wheels when the pad wear limit is reached.
Pull out the sensor plug on the left brake caliper with your fingers.
Press out the plastic caps of the fastening bolts with a screwdriver.
Do not pull on the wire while doing this.
Unscrew the bolts under the caps with a 7 mm hex wrench.
Pry out the bracket with a screwdriver.
Pull the caliper back and hang it with a wire on the body.
Attention: Do not disconnect the brake hose, otherwise you will have to bleed the air from the brakes after installation. Make sure that the brake hose is not under tension.
Pull out the brake pad.
The inner brake pad is spring-loaded to the caliper piston. Take out the block.
Installation
Attention: With the brake pads removed, do not press the brake pedal, otherwise the pistons may pop out of the caliper housing.
Check the pad wear sensor. If the contact plate insulation is frayed, the wire insulation is damaged, or the plastic parts are worn, replace the wear sensor.
Use a soft metal brush to clean the guide planes or pad sockets in the caliper body bore, or wipe them with a rag soaked in alcohol. Do not use mineral solvents or sharp instruments. If the brake pads are reused, they must also be cleaned.
Before installing the pad, it is necessary to check the brake disc by touch in order to detect scratches and gouges. Badly scratched discs should be replaced. Brake discs painted greyish or bluish must be cleaned.
Measure the brake disc thickness.
Check the dust cover on the piston for damage. Damaged boots must be replaced immediately, as dirt will lead to leaks in the caliper. To replace, you need to remove the caliper and disassemble it (In workshop).
Press the piston into the brake cylinder using the special tool. You can use a hardwood block (hammer handle). When doing this, care must be taken not to distort the piston and not to damage the piston surface and the dust cap.
Attention: When the piston is pushed in, the brake fluid will be squeezed out into the fluid reservoir. It is necessary to monitor the level of liquid in the tank and, if necessary, remove it with a syringe or rubber bulb.
Brake fluid is poisonous and must never be sucked out by mouth through a hose. After replacing the pads, you must not exceed the level of more than the MAX mark on the tank, as the liquid expands from temperature and may stand out from the tank, which will damage the paintwork and cause corrosion.
Attention: If the pads are heavily worn, the ease of movement of the piston should be checked. To do this, insert a block of wood into the caliper and the assistant should slowly press the brake pedal. The brake piston should slide in and out easily. To check another caliper must be installed. It is necessary to ensure that the piston is not completely squeezed out. With a heavy piston stroke, the caliper must be repaired in the workshop.
To prevent disc brakes from squeaking, apply a thin layer of special paste to the parts listed below.
Clean the contact surface (3) brake caliper and, in the places shown in the figure, apply a thin layer of anti-noise paste.
Clear Holder (brace) of the brake caliper in the places of the guides and, in the places shown in the figure, lubricate with a thin layer of anti-noise paste.
Caution: The paste must never get on the dust caps, the working surface of the brake pads or on the brake disc. If this does happen, the paste must be wiped off immediately and the area cleaned with alcohol or the dust caps replaced.
Caution: Do not lubricate the back of the brake pads.
Insert the brake shoe together with the spring into the brake piston.
Insert the outer pad into the caliper and slide the caliper over the brake disc. Make sure that the pads are installed in the guides clean.
Inspect the two brake caliper mounting bolts, clean the threads if necessary. If necessary, clean the threads in the bracket (fastening) caliper with a tap. Bolts with damaged threads or damaged by corrosion, replace. Tighten the bolts with a hex wrench to 30 Nm.
Attention: The bolts must be cleaned, do not lubricate them.
Put on the protective caps of the bolts.
Slide the wear sensor plug onto the brake shoe from the left side. The wire must fit into the recess in the cap for the bleed valve.
Slide the caliper onto the brake caliper.
Install the front wheels in accordance with the marks made earlier. Do not grease wheel bolts. Lower the vehicle and tighten the wheel bolts crosswise to 100 Nm.
Caution: With the vehicle stationary, depress the brake pedal firmly several times until a strong resistance is felt. In this case, the pads will lie against the brake disc and take the appropriate position.
Check the brake fluid level in the reservoir and, if necessary, top up to the MAX mark.
Do a security check:
- Are the brake lines tight?
- Is the brake hose in the mount?
- Are the bleed valves tight?
- Is there enough brake fluid in the reservoir?
- Carry out a tightness test with the engine running. To do this, press the brake pedal with a force of 200-00 N (corresponds to 20-30 kg) for about 10 seconds. The pedal must not go down. Check all brake system connections for tightness.
Gently break in the new brake pads by braking the vehicle several times from 80 km/h to 40 km/h on a light road with light pedal pressure. Allow the brakes to cool slightly between braking.
Attention: Before a run of 200 km, sudden braking should be avoided.