34 11 552 Overhauling left or right front brake caliper (brake caliper removed)

WARNING: This page does not describe the selected car, but rather 18 other vehicles, including the 2015 BMW Alpina B7L xDrive, 2015 BMW Alpina B7 xDrive, 2015 BMW 750i xDrive, 2015 BMW 750Li xDrive, and 2015 BMW 740Li xDrive. However, it is still accessible from the selected car via links, so may be relevant.

Special tools required:

00 9 316

WARNING: Risk of injury: In the following work step, large forces occur at the brake caliper piston (up to more than 2800 N).

NOTE: Use repair kit.

Check guide sleeves (1). If necessary, fit repair kit guide sleeve.

Fig 1: Identifying Front Brake Caliper Guide Sleeves

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Carefully force piston out through connecting bore (1) with compressed air.

To protect piston, place a protective plate (2) (e.g. hard wood or hardened felt) in caliper recess.

Do not grip piston with fingers - pinch hazard!

Fig 2: Removing Brake Caliper Piston From Connecting Bore Using Compressed Air

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Press off dust boot (1).

Fig 3: Identifying Brake Caliper Piston Dust Boot

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Carefully remove sealing ring (1) special tool 00 9 316 .

Clean cylinder bores and parts with spirits and dry with compressed air.

Thoroughly inspect cylinder bore, piston and flange surfaces for damage. Machining of cylinders and pistons is not permitted.

Install new sealing ring.

Installation note:

Apply a light coat of ANTI-SQUEAK/CORROSION PASTE to cylinder bore, piston and sealing ring.

Fig 4: Identifying Piston Sealing Ring

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Fit dust boot (1) in annular groove of piston (2).

IMPORTANT: Do not twist brake piston.

Press piston into cylinder bore.

Evenly press dust boot (1) onto brake caliper housing (3) to the limit position.

Installation note:

The area between the dust boot and the brake caliper housing (3) must be kept dry. It must not come into contact with brake cylinder paste or brake fluid so as to ensure that the dust boot is perfectly fitted.

Fig 5: Identifying Dust Boot, Piston And Brake Caliper Housing

Courtesy of BMW OF NORTH AMERICA, INC.