Removal
Caution: If the pads are to be used further, they must be marked before removal. Changing the pads between the right and left wheels and vice versa is not allowed. Such a replacement may lead to uneven operation of the brakes. Only original brake pads or pads recommended by the manufacturer must be installed. All pads on disc brakes must be replaced at the same time, even if only one of them has reached the wear limit.
Mark the position of the front wheels on the hubs so that they can be reinstalled in their original positions. Loosen the wheel nuts while the vehicle is on the ground. Raise and support the vehicle from the front and remove the front wheels.
Pull the caliper outward by hand, pushing the brake cylinder pistons back a little.
Use a screwdriver to pry the brake shoe mounting spring out of the caliper and remove it.
Use a blunt screwdriver to pry up the upper and lower protective caps (1) and remove them.
Unscrew both guide pins (2) from the caliper.
Hang the caliper on the body using wire.
Caution: The caliper must not hang on the brake hose, i.e. the hose must not be twisted or stretched.
Remove the outer brake pad from the caliper (1).
Remove the inner brake shoe (with pressure spring) from the brake piston (2).
(The original article is posted on Mazbook)
Installation
Caution: When the brake pads are removed, do not press the brake pedal, otherwise the piston will be squeezed out of the caliper housing. If the piston is accidentally squeezed out, remove the brake caliper and assemble it in a workshop.
Clean the guide surface or the socket in the housing with a soft metal brush and wipe with a cloth with alcohol. Do not use mineral solvents (gasoline, kerosene) or open-edged tools. If the brake pads are to be reused, clean them as well.
Before installing the pads, you need to feel the brake disc with your fingers, checking for scratches. Badly scratched discs need to be replaced.
Measure the thickness of the brake discs and, if necessary, replace worn discs.
Check the dust cap (1) on the piston (2) for damage. A damaged cap must be replaced, as dirt that gets inside will quickly cause the caliper to become loose. In this case, you will have to remove the caliper and repair it (in the workshop).
Press in the brake pistons using a special tool, which can be made from a piece of strong wood. Be careful not to skew the piston or damage the piston surface or dust cap.
Caution: When the piston is pressed, brake fluid will be squeezed out of the brake cylinders into the reservoir. Monitor the fluid level in the reservoir and, if necessary, suck it out of the reservoir.
Precautions: Use a glass or plastic container to collect the fluid. Brake fluid is poisonous and should not be sucked in through a hose. After replacing the brake pads, the fluid level in the reservoir should not exceed the "MAX" mark, since brake fluid expands when heated. Spilled brake fluid can damage paintwork, which will lead to corrosion.
Note: If the pads are worn differently, this is not a reason to worry. If the difference in thickness between the inner and outer pads is more than 2 mm, you need to check the caliper guide pins or pistons for freedom of movement. To do this, insert a wooden block into the caliper, and have an assistant slowly press the brake pedal. The pistons should be easily pressed in and out. To check, another caliper must be installed. Make sure that the brake piston is not completely pressed out. If the piston moves tightly, the caliper must be repaired (in the workshop).
The following operation is not always necessary: to prevent the brakes from squeaking, you can lubricate the back of the pad and its sides (arrows) with a thin layer of grease. Under no circumstances should the grease get on the working surfaces of the brake pads or on the brake disc. If this does happen, wipe off the grease immediately and clean the pad with alcohol.
Insert the inner shoe (with pressure spring) into the brake piston.
Place the outer shoe onto the bracket (2).
Install the brake caliper (3) and tighten the two guide pins in the bracket to a torque of 60 Nm.
Insert two protective caps. (1 - brake disc).
Insert the mounting spring into the caliper.
Note: After installation, the mounting spring must be pressed under the mounting bracket in both holes. If the mounting is incorrect, it is impossible to adjust the wear of the outer shoe, i.e. the pedal stroke will increase.
Install the front wheels so that the marks made earlier match. Before doing this, lubricate the centering hole of the disk with consistent grease. Tighten the wheel nuts. Lower the car and tighten the nuts crosswise to a torque of 90 Nm.
Press the brake pedal several times with the vehicle stationary so that the pads are in contact with the brake disc.
Check the brake fluid level in the reservoir and top it up to the "MAX" mark if necessary.
Conduct a security check.
Security check
Are the brake hoses tight?
Is the brake hose in the bracket?
Are the bleed valves tight? Is there enough brake fluid?
Conduct a tightness check with the engine running. To do this, press the brake pedal with a force of 200-300 N (20-30 kg) for 10 seconds. The pedal should not fall through. Check the tightness of all connections.
Carefully break in the new pads by braking the car several times on a road with light traffic from 80 to 40 km/h, pressing the pedal lightly. Allow the brakes to cool between brakings.