34 21 320 Removing and installing or replacing both rear brake discs

WARNING: This page does not describe the selected car, but rather 21 other vehicles, including the 2013 BMW 328xi, 2013 BMW 328i, 2012 BMW 328xi, 2012 BMW 328i, and 2011 BMW 328xi. However, it is still accessible from the selected car via links, so may be relevant.

Necessary preliminary tasks:

Remove wheels
Remove and clean brake pads

After completing work:

Adjusting handbrake
Read and comply with notes on braking in new brake discs / 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) .

If the brake discs are replaced, you must also fit new brake pads.

Always replace brake discs in pairs.

Fig 1: Set Points And Special Tool (34 1 280)

Courtesy of BMW OF NORTH AMERICA, INC.

Release screws (1). Remove and suspend brake caliper from vehicle.

Installation:

For tightening torque refer to 34 21 2AZ in 34 21 REAR BRAKE .

Fig 2: Brake Caliper And Screws

Courtesy of BMW OF NORTH AMERICA, INC.

IMPORTANT: To release brake disc: Do not under any circumstances strike friction ring with a hammer or similar!

If necessary, carefully tap on base of brake disc chamber with a rubber mallet.

Clean contact surface of brake disc at wheel hub thoroughly and remove traces of corrosion.

Unevenness on contact surface may result in distortion of brake disc!

Release screws (1) and remove brake disc.

Installation:

Replace screws.

For tightening torque refer to 34 21 1AZ in 34 21 REAR BRAKE .

Fig 3: Identifying Screws And Brake Disc

Courtesy of BMW OF NORTH AMERICA, INC.