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

Necessary preliminary work:

After completing repair work: BLEED BRAKE SYSTEM .

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: Locating Brake Pedal Support

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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 note:

Tightening torque 34 32 1AZ .

Fig 2: Identifying Square Head Brake Hose And Brake Line

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Detach brake hose (1) from brake caliper.

Installation note:

Tightening torque 34 32 3AZ .

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

Fig 3: Identifying Brake Caliper Hose

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NOTE: First tighten brake hose on brake caliper.

If necessary, remove BRAKE PAD WEAR SENSOR .

Lift out retaining spring (1).

Fig 4: Removing Rear Disc Brake Retaining Spring

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Remove cover plug (1).

Fig 5: Identifying Rear Brake Pad Cover Plug

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Unscrew guide bolts (1).

Withdraw brake caliper backwards.

Installation note:

Tightening torque 34 21 4AZ .

Clean guide bolts only; do not grease.

Check threads.

Replace all guide bolts which are not in perfect condition.

Fig 6: Identifying Brake Caliper Guide Bolts

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IMPORTANT: Mark any worn brake pads.

In the event of one-sided brake pad wear, do not change brake pads round.

Remove brake pads in direction of arrow.

Fig 7: Removing Outer Brake Pad

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