Removing the brake pads is identical for the entire system and must be carried out in the following order.
Prepare fixtures «34.1.050» And «34.1.080». Apply the parking brake and slightly loosen the wheel bolts, front or rear, depending on the brake mechanism to be replaced. Flag (paint or marker) the relative position of the wheels, brake discs and wheel hubs.
Using a syringe, pump out some of the brake fluid from the reservoir. Raise front (or back) part of the car, put it on stands and remove the wheels.
Flag (paint or marker) the relative position of the brake pads in relation to the calipers, if these pads are used in the future.
Attention! Brake pads must always be replaced in pairs (included 4 pcs.), even if the lining of only one pad is worn out, and at the same time on both brake mechanisms of the front (or rear) wheels. Rearranging pads is prohibited.
Remove retaining spring (1, fig. 11.6).
Disconnect the AL of the brake pad thickness sensor cable on the left caliper (arrow, fig. 9.5) pulling out the stopper. Pulling on the wire is strictly prohibited. Remove protective caps (5) guide fingers using a screwdriver. Remove the brake hose from the holder.
Loosen the lower and upper guide pins (6) caliper fixture «34.1.080» or with a hex wrench «7 mm». Remove the caliper by moving it back. Attach the caliper to the car body with a wire clamp. Do not disconnect the brake hose, make sure that it is not under tension.
Using fixture «34.1.050» (pic. 11.7), move the piston as far as possible inside the cylinder.
Attention! It is strictly forbidden to press the brake pedal when the brake pads are removed; this will cause the piston to fall out of the caliper, loss of brake fluid and depressurization of the system.
Monitor the brake fluid level.
Mark removed pads.
Check the thickness of the brake discs and the residual thickness of the brake lining.
Do not apply grease to the back plate of the pad.
The dust cap must not come into contact with the paste to prevent brake squeal.
Remove outer and outer brake pads (pic. 11.8).
Note that the inner brake shoe is attached to the piston by a leaf spring.
The installation of the brake pads should be carried out in the reverse order, while it is necessary to clean the brake pads, you should work in a respirator. Clean the guide surfaces and the places where the pads are installed in the housing opening with a soft metal brush and wipe with a rag soaked in alcohol.
Check the cleanliness of the working surfaces of the brake discs with your fingers. Warping, risks and workings are not allowed. To remove them, grind the disc simultaneously on both sides so that its thickness meets the requirements of the Technical Specifications table.
Before installing, measure the actual thickness of the brake discs and brake pads. Brake discs with a gray or blue coating must be cleaned before installing new pads.
Check wear sensor. If the insulation of the contact plate is worn, the cable insulation is damaged or the plastic element is worn out, replace the sensor.
Check for cracks on the dust seal (1, fig. 11.9) brake cylinder piston. A damaged cuff must be replaced immediately, as penetrating dust leads to leakage. The replacement of the cuff should be carried out with the removal and disassembly of the caliper at the workshop. Clean the contact surface (2) piston of the brake cylinder and lubricate it with a thin layer of paste such as Plastilube, to prevent squealing of the brake mechanism.
Clean contact surfaces (1 and 2, fig. 11.10) T-ends of the brake pads and caliper housing, top and bottom, and lubricate them with a thin layer of paste to prevent brake squeal.
Clean the contact surface (3, fig. 11.11) disc brake caliper and coat it with a thin layer of paste to prevent brake squeal.
Clean the caliper bracket in the T-rail areas (arrows, fig. 11.12) and lubricate them with a thin layer of paste to prevent squealing of the brake mechanism.
Install the piston in the caliper using a special tool or a wooden, plastic mandrel, without distortions. In this case, it is necessary to take care not to damage the surface of the piston and the dustproof cuff, as well as the level of brake fluid in the compensation tank and remove it in time with a pear siphon. After changing the brake pads, the mark «MAX» on the brake fluid reservoir must not be exceeded.
Check (together) ease of piston movement. Install a wooden block in the caliper, slowly press and release the brake pedal - the brake cylinder piston should easily come out and come back. At the same time, the rest of the brake mechanisms must be in working order. Brake caliper repairs should be carried out at a workshop.
Attention! The brake pads on the piston side are tied in the direction of travel. Brake shoe with marking «L» mounted on the left side of the vehicle (pic. 11.13). Brake shoe with marking «R» installed on the right, inside of the car (pic. 11.14).
Install the inner pad into the caliper piston with spring clips. Install the outer brake pad into the caliper, lining against the brake disc. The pads must be clean and fit exactly into the guides.
Clean and check the condition of the threads in the caliper and bracket. If necessary, clean the thread by passing it with a tap. Set the caliper in working position, insert serviceable and clean (without lubrication) guide pins and tighten them to a torque - front 30.5 Nm (3.05 kgf·m), rear 28.0 Nm (2.8 kgf·m).
Install the protective caps into the holes of the guide pins. Connect the wheel brake pad wear sensor to the cable harness. The wire must be routed through the loop of the cap on the bleed valve. Install the brake pad spring onto the caliper.
Attention! Repeatedly depress the brake pedal strongly until you feel strong resistance. In this case, the brake pads will take up their working position.
Bleed the brake system. Install and temporarily fix (wrap by hand) wheel bolts. After lowering the vehicle, tighten the wheel bolts crosswise to 140 Nm (14.0 kgf·m).
Check the tightness of the brake system bleeder fittings, connections for leaks, fluid leakage is not allowed. Check the brake fluid level and restore it to the mark» max».
Check the tightness of the brake system with the engine running. For what, press the pedal several times with a force of 20–30 kgf and hold it for 10 seconds, the pedal should not sink.
Set the ignition key to position «1» and maintain a 30 second pause without starting the engine. At the same time, information about the wear of the brake linings is erased from the RAM of the ECU ECU. When driving with new brake pads, follow the recommendations above for running them in.
When replacing the brake pads on the rear wheel, the position of the retaining spring must be taken into account (pic. 11.15).