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

WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2012 BMW 328xi, 2012 BMW 328i, 2011 BMW 328xi, 2011 BMW 328i, and 2010 BMW 328xi. However, it is still accessible from the selected car via links, so may be relevant.

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

Risk of injury!

Check guide sleeves (5), fitting repair-kit guide sleeve if necessary.

Fig 1: Identifying Guide Sleeves

Courtesy of BMW OF NORTH AMERICA, INC.

Carefully force piston out through connection bore with compressed air.

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

Do not grip piston with fingers - risk of trapping!

Fig 2: Forcing Piston Out Through Connection Bore With Compressed Air

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Press off dust sleeve (1).

Fig 3: Identifying Dust Sleeve

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

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

Thoroughly inspect cylinder bore, piston and flange surfaces.

Machining of cylinders and pistons is not permitted.

Install new seal.

Installation:

Apply a light coat of Ate brake cylinder paste to cylinder bore, piston and seal. Refer to BRAKE SYSTEM - OPERATING FLUIDS

Fig 4: Removing Sealing Ring Using Special Tool (00 9 316)

Courtesy of BMW OF NORTH AMERICA, INC.

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

IMPORTANT: Do not twist brake piston.

Press piston into cylinder bore.

Evenly press dust sleeve (1) onto brake caliper housing as far as it will go.

Installation:

The area between the dust sleeve and the brake caliper housing must be kept dry. It must not come into contact with Ate brake cylinder paste or brake fluid so as to ensure that the dust sleeve is perfectly seated.

Fig 5: Identifying Dust Sleeve And Piston

Courtesy of BMW OF NORTH AMERICA, INC.