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

WARNING: This page is about a different car, the 2010 BMW 135i, 2009 BMW 135i, and 2008 BMW 135i. 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 Service.

IMPORTANT: To protect the pistons, place a protective plate (1) (e.g. hard wood or hard felt) in caliper recess.
Do not grip piston with fingers - risk of trapping!

Carefully force piston out through brake hose connection bore with compressed air.

Installation:

Do not jam piston when pressing in.

Fig 1: Identifying Protective Plate

Courtesy of BMW OF NORTH AMERICA, INC.

Press off dust sleeve (1).

Fig 2: Identifying Dust Sleeve

Courtesy of BMW OF NORTH AMERICA, INC.

IMPORTANT: Machining of cylinders and pistons is not permitted.

Installation:

Dust sleeve must be correctly seated in groove (1) of piston and groove (2) of brake caliper.

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 3: Identifying Groove Of Piston And Brake Caliper

Courtesy of BMW OF NORTH AMERICA, INC.