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

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

Necessary preliminary tasks

NOTE: After completing tasks, bleed brake system. See 3400048 BLEEDING BRAKE SYSTEM WITH ABS/ASC+T or 3400050 Bleeding brake system with DSC .

Press clutch 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: Locating Brake Tensioner

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Detach locking clip (1) in direction of arrow.

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

Feed out parking brake Bowden cable (2) downwards.

Fig 2: Removing Locking Clip

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

Disconnect brake hose from brake line (1).

Installation:

Tightening torque 34 32 1AZ .

Fig 3: Identifying Brake Line With Square Head

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Disengage brake hose from holder (1).

Detach brake hose (2) from brake caliper.

Installation:

Tightening torque 34 32 3AZ .

Fig 4: Identifying Brake Hose With Holder

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

Unscrew guide bolts (1).

If necessary, grip at hexagon head (2).

Remove brake caliper.

Installation:

Replace guide screws.

Tightening torque 34 21 3AZ .

Fig 5: Identifying Guide Bolts And Hexagon Head

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