Attention: It is necessary to replace all the brake pads of one vehicle axle at the same time, even if only one of them has reached the wear limit! Use only pads approved by the manufacturer!
Removing
Attention: After removing the brake pads, do not press the brake pedal, otherwise the piston may be squeezed out of the housing. In this case, to install the piston in place, you will have to contact the service station.
1. Apply the parking brake, jack up the front of the vehicle and place it on jack stands. Remove the front wheels.
2. Disconnect the brake pad wear sensor wiring connector, release the wiring harness from the intermediate holders and take it aside (see resist. illustration).
5.2 Disconnecting the wiring for the brake pad wear sensor (left caliper) - the arrows indicate the harness holders: 1. Wiring connector
3. Using a screwdriver, disconnect the spring clips (see resist. illustration) brake pads from the caliper and remove them.
5.3 Spring clamp (2) front wheel brake
4. Remove the dust caps of the caliper guide pin holes (see resist. illustration). Be careful not to damage the ABS wheel sensor wiring.
5.4 Dust caps (3) guide pins (4) caliper
Note: The brake hose does not need to be disconnected from the caliper as shown in the illustration.
5. Turn out bolts of fastening of directing fingers and remove a support with an internal brake pad (see resist. illustration). Remove the inner pad with wear indicator from the caliper and tie the caliper to the strut with a piece of wire, do not leave it hanging on the hose.
5.5 Removing the inner (5) and outdoor (6) front wheel brake pads: 4. Caliper
6. Remove the outer shoe (see illustration 5.5) from the guide.
Attention: If you plan to re-install the same brake pads, when removing them, you must mark the places of their installation. It is not allowed to change the brake pads from the outside to the inside and from the right wheel to the left!
Examination
7. Sweep away dust accumulated on their surfaces from the brake components (see Precautions in Section 1). Wipe the caliper and piston face with a clean rag. Remove rust from the edge of the brake disc.
8. Check the condition and thickness of the brake pads (see Chapter 1, Section 14) Oily pads must be replaced without fail, first eliminate the cause of the development of the leak. Feel the surface of the brake disc with your fingers. A brake disc that has irregularities can be machined if it is thick enough - contact a specialist.
Attention: Both brake discs of the same axle must always be machined to the same thickness.
If the thickness of the disk has reached the wear limit (see specs), replace both discs of the same axle.
9. If the condition of the brake pads and disc is found to be satisfactory, carefully clean them and the contact surfaces of the brake discs from dirt with a soft wire brush, paying particular attention to the back and sides. Clean the grooves in the friction linings, completely removing foreign inclusions from them. Clean the pad seats in the caliper and anchor bracket. After that, wipe all mating surfaces with a rag soaked in alcohol.
Caution: Use only alcohol to clean the brakes, and do not use sharp-edged tools to avoid damage to the seals!
10. The guide pins should move easily in the caliper bushings, clean the pins if necessary. Check the condition of the piston seal, inspect the piston for signs of brake fluid leakage, corrosion and mechanical damage. Replace defective components. Disassembly of the caliper for refurbishment and replacement of the piston collar should only be done at a service station.
Installation
11. When installing new pads, the piston must be sunk into the caliper cylinder in order to release it for installing thicker new pads. The piston is pressed using a special tool (e.g. Hazet 4970/6), although a suitable clamp or wooden lever will work equally well, if necessary, lay the old brake shoe as a supporting surface in front of the piston. Be careful not to damage the piston surface and protective cap. When the piston reverses, the brake fluid is squeezed out of the brake cylinder into the reservoir, so the reservoir cap must be removed. To prevent leakage of brake fluid, first check its level - if necessary, pump out the excess.
Caution: Pushing the piston in comes with a risk of damage to the sealing collar and the piston surface - be careful!
12. Before installing new brake pads, clean the mating surfaces of the brake mechanism and guides. Lubricate the guide surfaces of the pads (see resist. illustration) thin layer of heat-resistant grease (e.g. Liqui Moly paste).
5.12 Lubrication points (indicated by arrows) brake shoe guide: 7. Brake piston
13. Insert the outer brake pad into the guide and the inner brake pad with wear indicator into the caliper (see illustration 5.5)
14. Install the caliper on the guide, screw in the bolts of the guide pins, tighten them with the required force (30 Nm) and put on protective caps.
15. Install the caliper spring clips by inserting their ends into the holes and push them under the shoe guide.
16. Squeeze the foot brake pedal several times until you feel a firm movement - the brake pads are in contact with the discs and occupy a position corresponding to the state of operation.
17. In the same manner, replace the brake pads on the opposite wheel.
18. Install the wheels, lower the vehicle to the ground and tighten the wheel bolts to specification.
19. Check the brake fluid level, correct if necessary (see chapter 1).
20. Before starting intensive use, let the brake pads get used a little, for which brake the car several times from a speed of 80 km / h to a speed of 40 km / h by gently pressing the pedal. Then let the brake cool down.
Note: After changing the pads, try to avoid sudden braking as much as possible for about 200 km.
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