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

WARNING: This page is about a different car, the 2013 BMW 550i GT, 2012 BMW 550i GT, 2011 BMW 550i GT, and 2010 BMW 550i GT. However, it is still accessible from the selected car via links, so may be relevant.

Necessary preliminary work

Remove WHEEL .
Read and comply with GENERAL INFORMATION .

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 Tensioner

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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 Brake Line And Square Head

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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.

NOTE: First tighten brake hose on brake caliper.

Fig 3: Identifying Brake Caliper

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If necessary, remove BRAKE PAD WEAR SENSOR .

Lift out retaining spring (1).

Fig 4: Lifting Retaining Spring

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Remove cover plug (1).

Fig 5: Identifying 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 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.

If necessary, clean BRAKE CALIPER AND BRAKE PAD .

Fig 7: Removing Outer Brake Pad

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