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

WARNING: This page is about a different car, the 2011 BMW M3, 2010 BMW M3, 2009 BMW M3, and 2008 BMW M3. 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!

NOTE: Use repair kit, refer to BMW Parts Department.

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

Fig 1: Identifying Guide Sleeve

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 Through Connection Bore Using Compressed Air

Courtesy of BMW OF NORTH AMERICA, INC.

Press off dust sleeve (1).

Fig 3: Identifying Dust Sleeve

Courtesy of BMW OF NORTH AMERICA, INC.

Carefully remove sealing ring (1) special tool 009316 WEDGE .

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.

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

Courtesy of BMW OF NORTH AMERICA, INC.

Installation:

Apply a light coat of brake fluid to cylinder bore, piston and seal,

refer to BRAKES - OPERATING FLUIDS .

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

IMPORTANT: Do not twist brake piston.

Fig 5: Identifying Dust Sleeve And Piston

Courtesy of BMW OF NORTH AMERICA, INC.

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.