34 21 320 Removing and installing/renewing both brake discs

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2016 BMW 328i xDrive, 2016 BMW 328d xDrive, 2015 BMW 328i xDrive, 2015 BMW 328d xDrive, and 2014 BMW 328i xDrive. However, it is still accessible from the selected car via links, so may be relevant.

Special tools required:

34 1 280

Necessary preliminary tasks:

Remove and clean BRAKE PADS .

Check minimum brake disc thickness:

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

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

Always replace brake discs in pairs.

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 bolts (1) and detach brake anchor plate.

Installation note:

Replace screws.

Tightening torque: 34 21 2AZ .

Fig 2: Detaching Brake Anchor Plate

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!

Fig 3: Identifying Brake Disc Screws

Courtesy of BMW OF NORTH AMERICA, INC.

Release screw (1) and remove brake disc (2).

Installation note:

Replace screw.

Tightening torque: 34 21 1AZ .

After installation:

Adjusting PARKING BRAKE
Read and comply with notes on BREAKING IN NEW BRAKE DISCS/BRAKE PADS .