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

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2013 BMW 128i, 2012 BMW 128i, 2011 BMW 128i, 2010 BMW 128i, and 2009 BMW 128i. However, it is still accessible from the selected car via links, so may be relevant.

Special tools required:

00 9 316

See MAINTENANCE AND GENERAL INFORMATION - SPECIAL TOOLS

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: Placing Protective Plate

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 seal (1) with 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 BRAKES - OPERATING FLUIDS .

Fig 4: Removing Seal With 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 Annular Groove Of Piston

Courtesy of BMW OF NORTH AMERICA, INC.