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

Special tools required:

34 1 280

Necessary preliminary tasks:

Remove WHEELS .
Remove and clean BRAKE PADS .

After completing repair work:

Adjust PARKING BRAKE .
Read and comply with notes on BREAKING 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 .

NOTE: If the brake discs are replaced, you must also fit new brake pads.
Always replace brake discs in pairs.

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

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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). Detach brake-caliper support.

Installation note:

Tightening torque 34 21 2AZ .

Fig 2: Identifying Brake-Caliper Support Screws

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

Installation note:

Replace screw.

Tightening torque 34 21 1AZ .

Fig 3: Identifying Brake Disc And Screws

Courtesy of BMW OF NORTH AMERICA, INC.