Withdrawal
Remove the wheel trim.
Mark with paint the position of the rims on the rear wheel hubs. Thanks to this, the subsequently balanced wheel is set to the same position.
Loosen the wheel bolts of the corresponding rear wheel. In this case, the car must still be on the ground.
Raise the rear of the car and remove the wheel.
![](https://www.bmwman.ru/img/ser3/1456.jpg)
Unplug connector for wear indicator -arrow- at brake caliper on right wheel, do not pull on cable.
Loosen the mounting bolts -8- of the brake caliper with a 17 mm spanner and remove the caliper together with the installed brake pads from the brake disc.
Remove the brake caliper with the inserted brake pads from the brake disc.
![](https://www.bmwman.ru/img/ser3/1457.jpg)
Hang the brake caliper to the body on a homemade wire hook. Do not tighten the brake hose while doing this.
![](https://www.bmwman.ru/img/ser3/1458.jpg)
If complete removal of the brake caliper or removal of the brake hose from the brake caliper is required, unscrew the brake hose -arrow- while holding the hexagon on the hose with a wrench. In other cases, the brake hose may not turn off.
Caution: Collect leaking brake fluid in a bottle designed exclusively for brake fluid. You can also suck the brake fluid out of the expansion tank.
Loosen the fastening bolt -arrow with a 5 mm spanner (Drawing W 4474).
Release the handbrake.
Remove the brake disc If the disc cannot be removed, spread the hand brake pads.
Installation
To ensure uniform braking on both sides, the surfaces of both discs must be the same in surface finish and finish. Therefore, perform simultaneous replacement or processing of both disks.
A service station can check the runout of the discs. Maximum lateral runout (in position): 0.2 mm.
Measure the thickness of the disk.
Clean new discs with nitro thinner to remove protective varnish.
Slide the brake disc onto the wheel hub and secure with the bolt. Pre-turn the brake disc so that the bolt holes match.
Position the brake caliper with the brake pads inserted onto the brake disc.
Tighten the brake caliper mounting bolts with a 17 mm ring wrench to a tightening torque of 70 Nm.
Attention: If the brake hose was removed, wrap it at the connection with the brake circuit. Remove air from the brake system.
On the right side of the vehicle, connect the wear sensor connector and secure it to the strut.
Install the rear wheel, observing the marked position of the disk on the hub. Lower the vehicle and cross-tighten the wheel hubs to 110 Nm.
Caution: With the vehicle stationary, depress the brake pedal several times until a hard resistance appears. In this case, the brake pads approach the brake discs and take their working position.
Check the brake fluid level in the reservoir.
Carefully run in new brake discs in 3 steps.
- Stage 1: 5 hard braking at 50 km/h on a deserted street. Step 2: Let the brakes cool down.
- Stage 3: a few more braking at a speed of 50 km / h.