34 21 320 Removing and installing/replacing both brake discs

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

Notes

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

Necessary preliminary work

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: Positioning Special Tool (34 1 280) At Three Measuring Points

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: Identifying Holder And Screws

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.

Fig 3: Releasing Screw

Courtesy of BMW OF NORTH AMERICA, INC.

Release mounting bolt (1).

Remove brake disc.

Installation note:

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!