Disc brake pads must be replaced on both wheels at the same time - NEVER change pads on only one wheel. In addition, the dust generated by the brake system may contain asbestos which is harmful to your health. Never blow it out with compressed air or inhale it. When working on the brakes, a special filter mask should be worn. Never, under any circumstances, use gasoline-based solvents to clean brake parts. Use only brake cleaner! When servicing disc brakes, use only original or high quality branded brake pads.
Brake fluid is poisonous. It also dissolves paint a lot. See the Warning at the beginning of the Section Bleeding the hydraulic brake system.
The following procedure applies to both front and rear disc brakes.
1. Remove the cover (lids) from the brake fluid reservoir and drain about two-thirds of the fluid from the reservoir. If you don't, fluid will overflow from the reservoir when the caliper pistons are pressed into their bores.
2. Loosen the wheel bolts, jack up the front or rear of the vehicle and place it securely on axle stands.
3. Remove the front or rear wheels as needed. Work on each side of the brakes in turn so that the assembled side can serve as a reference for assembly if necessary.
4. Carefully inspect the brake disc, as described in Section Inspection, removal and installation of the brake disc. If machining is required, remove the disc as described in the same Section, while you can also remove the pads from the calipers.
5. Following the descriptions in the illustrations below, perform the procedure for removing the brake pads.
There are no photos here describing the procedure for the rear calipers; slightly different in size, they are identical in design to the front brake calipers.
Some models may have different numbers and types of anti-squeal gaskets and other details from those shown in this Chapter. Before dismantling, you should pay attention to how the parts are installed in the car in order to be able to reassemble them correctly in the future.
6. Disconnect the brake pad wear sensor electrical connector.
7. Remove plugs from bolts of fastening of a brake support and give bolts.
8. Remove anti-squeal spring.
9. Push the piston through the C-clamp.
10. Remove the caliper and inner brake shoe.
11. Remove the inner brake shoe from the piston.
12. Hang the caliper on a piece of wire so that it does not interfere with work.
13. Remove the outer brake pad - to install new pads, reverse the procedure.
14. Don't forget to inspect the pad wear sensors (front left wheel only, or front left and rear right wheels). If they are in order, reinstall them from the old pads to the new ones; if they are worn from friction, install new sensors on new pads.
15. Installing new pads repeats the removal procedure in reverse order. When installing the caliper, make sure that all mounting bolts are tightened to the required torque.
16. Upon completion of work, strongly depress the brake pedal several times to bring the pads into contact with the discs. The pedal should be at a normal height from the floor and not sink. Check the brake fluid level and top up if necessary. Thoroughly check for fluid leaks and check that the brakes are working well before normal vehicle operation.
17. If possible, avoid sudden braking for the first 80 - 100 km of run, until the new pads rub into place.