34 21 745 Removing and installing/replacing left or right rear brake caliper

Necessary preliminary tasks:

Remove rear wheel .

After completing tasks, bleed brake system, see 34 00 050 Bleeding brake system with DSC .

Apply pedal prop and depress brake pedal slightly. This prevents brake fluid from emerging from the expansion tank and air from entering the brake system when the brake lines are opened.

Fig 1: Locating Pedal Prop

Courtesy of BMW OF NORTH AMERICA, INC.

Slacken union nut (1); to do so, grip brake hose at square (2).

Installation:

Tightening torque: 34 32 1AZ, see 34 32 BRAKE LINES .

Detach brake hose from brake caliper (3).

Installation:

Tightening torque: 34 32 2AZ, see 34 32 BRAKE LINES .

Fig 2: Brake Hose From Brake Caliper And Slacken Union Nut

Courtesy of BMW OF NORTH AMERICA, INC.

Release screws (1).

Installation:

Tightening torque: 34 21 3AZ, see 34 21 REAR BRAKE .

Right side:

Disconnect plug connection for brake lining wear sensor.

Pull off fist caliper towards rear of vehicle.

Fig 3: Disconnecting Plug Connection For Brake Lining Wear Sensor

Courtesy of BMW OF NORTH AMERICA, INC.

IMPORTANT: Install brake hose without torsional stress.

First tighten the brake hose on the brake cover, then tighten connection on brake line.

Never twist brake hose when installing it and avoid all contact with parts attached rigidly to the body.

Check routing and securing of brake-pad-wear indicator cable. Check for correct securing with tab of dust cap. It is absolutely essential to prevent the cable on the rim from being scuffed.