34 21 320 Removing and installing/renewing both brake discs

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

Special tools required:

34 1 280

Necessary preliminary tasks

Remove WHEELS .
Remove and clean brake pads . See 34 21 200 REMOVING AND INSTALLING OR REPLACING BRAKE PADS ON BOTH REAR DISC BRAKES (TEVES FLOATING CALIPER) or 34 21 200 REMOVING AND INSTALLING OR REPLACING BRAKE PADS ON BOTH REAR DISC BRAKES (TRW FLOATING CALIPER) .

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: Identifying Brake Anchor Plate Bolts

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 And Screw

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 .