34 21 320 Removing and installing/replacing both brake discs

WARNING: This page is about a different variant/trim than selected.

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 .

New brake pads may only be installed if the brake disc thickness is greater than or equal to the MINIMUM BRAKE DISC THICKNESS (MIN TH).

Fig 1: Identifying Special Tool (34 1 280)

Courtesy of BMW OF NORTH AMERICA, INC.

Release screws (1) and remove holder (2). Installation note: Tightening torque 34 21 2AZ .

Fig 2: Identifying Screws And 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 hammer against the brake disc nave.

Release mounting bolt (1).

Remove brake disc.

Installation:

Replace screw.

Tightening torque 34 21 1AZ

Clean contract face of wheel hub thoroughly and remove any traces of rust if necessary.

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

Fig 3: Identifying Mounting Bolt

Courtesy of BMW OF NORTH AMERICA, INC.