34 21 745 Removing and installing/replacing left or right rear brake caliper

Necessary preliminary tasks:

NOTE: After completing tasks, bleed brake system. See BLEEDING BRAKE SYSTEM WITH ABS/ASC+T or BLEEDING BRAKE SYSTEM WITH DSC .

Press brake pedal down to floor and secure with pedal support.

NOTE: The pedal support may only be released when the brake lines are reconnected.

This prevents brake fluid from emerging from the expansion tank and air from entering the system when the brake lines are opened.

Fig 1: Securing Brake Pedal With Pedal Support

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Detach retaining clip (1) in direction of arrow.

Disengage parking brake Bowden cable (2) from operating lever (3) at brake caliper.

Feed out parking brake Bowden cable (2) downwards.

Fig 2: Disengaging Parking Brake Bowden Cable From Actuating Lever At Brake Caliper

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IMPORTANT: Grip brake hose at square head (2) so that connecting piece can not rotate in retaining bracket.

Disconnect brake hose from brake line (1).

Installation note:

Tightening torque 34 32 1AZ .

Fig 3: Identifying Brake Line And Square Head

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Detach brake hose from bracket (1).

Detach brake hose (2) from brake caliper.

Installation note:

Tightening torque 34 32 3AZ .

Fig 4: Identifying Brake Hose Bracket

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IMPORTANT: Never twist brake hose when installing it and avoid all contact with parts attached rigidly to the body.

NOTE: First tighten brake hose on brake caliper.
Insert brake hose in bracket and screw onto brake pipe.

Pull brake pad wear sensor out of brake lining (right side only).

Unscrew guide bolts (1).

If necessary, grip at hexagon head (2).

Remove brake caliper.

Installation note:

Replace guide bolts.

Tightening torque 34 21 3AZ .

Fig 5: Identifying Guide Bolts And Hexagon Head

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