Front wheel caliper | Rear wheel support |
Removing
1. Mark with paint the position of the wheels relative to the hub. Thanks to this, the balanced wheel after removal can be put in its place so that the balance is not disturbed. Loosen the wheel bolts without lifting the vehicle, then place the vehicle on stands and remove the wheels.
2. Switch off the ignition. Unscrew and remove the ABS speed sensor (L6/1).
3. Unscrew the 2 rear wheel brake caliper mounting bolts (35) to the wheel bearing housing and remove it outwards.
4. Hang the caliper with a homemade hook to the body so that the brake hose and brake pad wear sensor wire are not twisted or overtightened.
5. If the caliper must be removed completely, first unscrew the brake hose (51) from the hydraulic line, using an open double ring wrench 9x11 mm for this. Then unscrew the brake hose from the caliper.
Attention! The brake fluid will leak. Close the openings immediately with plugs so that the tank does not empty. After installation, the brake system must be bled. In vehicles with ASR traction control, bleeding the brakes requires a special tool used in specialized workshops. Collect the escaping brake fluid in a specially designed container. Follow instructions for handling brake fluid (see subsection 11.10.).
6. Disconnect the pad wear sensor at the caliper connector. Unscrew the connector from the caliper.
Installation
1. When replacing, keep in mind: the brake mechanism on both wheels of the same axle must have the same pistons from the same manufacturer.
2. Front brakes: fit the caliper and tighten it to the hub with two new self-locking bolts to 115 Nm.
Attention! If the bolts are hard, clean the threads from the remnants of the fastener using a tap M 12x1.5.
3. Rear brakes: install the caliper and secure with two new self-locking bolts on the hub with a torque of 50 Nm, in cars with ASR - 70 Nm.
Attention! If the bolts are hard, clean the threads of the remnants of the fastener using an M 10 tap.
4. If the brake hose was removed, screw it with a torque of 15 Nm to the hydraulic line. The hose must not be twisted during installation. On bracket (52) locking plate fixed (60) with dodecahedron. brake hose (51) insert into the lock plate so that it moves freely when the wheel is fully rotated to the left and right, while the suspension spring is compressed and stretched. 4 - hydraulic line, 13 - cap screw, 59 - brake hose bracket.
5. Lubricate the ABS speed sensor hole with Molykote Longtherm 2. Check the O-ring and replace if necessary. Install the speed sensor, tightening it with a new hexagon socket bolt with a torque of 20 Nm,
6. Connect the pad wear sensor wire to the connector on the caliper.
7. If the brake system opens, bleed the brakes.
8. Align the wheels so that the markings made before removing them match. Screw on the wheels. Remove the car from the supports and tighten the wheel bolts in a crosswise manner with a torque of 110 Nm.
Attention! Vigorously depress the brake pedal repeatedly until you feel strong resistance. Thanks to this, the brake pads are adjusted.
9. Check the brake fluid level in the reservoir, top up if necessary.
Attention! Carry out a security check:
- Are the brake hoses tightened?
- is the brake hose in the bracket;
- Are the bleed screws tight?
- Is the brake fluid level OK?
Attention! With the engine running, check the tightness. To do this, press the brake pedal with a force of 200 to 300 N (20–30 kg) for approximately 10 seconds. The pedal must not move. Check the tightness of all connections.
10. Finally, make a few stops on a quiet street.