34 21 320 Removing and installing/replacing both brake discs

Special tools required:

34 1 280

IMPORTANT: Always replace brake discs in pairs.
New brake pads must always be fitted when replacing the brake discs.

Necessary preliminary tasks:

REMOVE rear brake pads.

Check minimum brake disc thickness:

Position special tool 34 1 280 at three measuring points in area (1) and measure.
Compare measurement result and lowest value with SETPOINT VALUE .

Fig 1: Checking Minimum Brake Disc Thickness
Courtesy of BMW OF NORTH AMERICA, INC.

IMPORTANT: New brake pads may only be fitted if the brake disc thickness is greater than the MINIMUM BRAKE DISC THICKNESS (MIN TH).

Release screws (1) and remove holder (2).

Installation note:

Tightening torque 34 21 2AZ .

Fig 2: Removing Holder

Courtesy of BMW OF NORTH AMERICA, INC.

IMPORTANT: When removing the brake disc: On no account strike the friction ring with a hammer or similar object! If necessary, carefully tap with a rubber mallet against the brake disc chamber.

Release mounting bolt (1).

Remove brake disc.

Installation note:

Replace screw.

Fig 3: Removing Brake Disc Screw

Courtesy of BMW OF NORTH AMERICA, INC.

Tightening torque 34 21 1AZ .

Clean contact surface of wheel hub thoroughly and remove any traces of rust if necessary.

Irregularities in the contact surface can cause distortion in the brake disc!