34 21 320 Removing and installing/replacing both brake discs

Special tools required:

34 1 280

CAUTION: Brake discs must only be replaced in pairs (per axle).
Fit new brake discs only together with new brake pads.

Necessary preliminary work:

Remove the REAR BRAKE PADS.

Removal:

Release screws (1) and remove holder (2).

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CAUTION: When removing the brake disc: Do not under any circumstances strike friction ring with a hammer or similar! If necessary, carefully tap with a rubber mallet against the brake disc chamber.

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

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Installation:

Check minimum brake disc thickness:

Position special tool 34 1 280 at three measuring points in area (1) and measure.
Compare measuring result and also compare the lowest value.

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CAUTION: New brake pads may only be fitted if the brake disc thickness is greater than the minimum brake disc thickness (MIN TH). Refer to: TECHNICAL DATA

Clean contact surface of wheel hub thoroughly and remove any traces of rust if necessary.

Irregularities in the contact surface can cause distortion in the brake disc!

Install brake disc (2).

Insert screw (1) and tighten.

Tightening torque, refer to: 34 21 1AZ .

Replace screw (1).

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Parts: Screw

Attach holder (1).

Insert screws (2) and tighten.

Tightening torque, refer to: 34 21 2AZ .

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Required follow-up work:

After completing repair work, read and comply with NOTES ON BREAKING IN NEW BRAKE DISCS/BRAKE PADS .
Install the REAR BRAKE PADS .