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

WARNING: This page does not describe the selected car, but rather 21 other vehicles, including the 2013 BMW 328xi, 2013 BMW 328i, 2012 BMW 328xi, 2012 BMW 328i, and 2011 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).

Danger of injury!

NOTE: Use repair kit.

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

Fig 1: Guide Sleeves

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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: Caliper Recess Protective Plate

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Press off dust sleeve (1).

Fig 3: Dust Sleeve

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Carefully remove seal (1) with special tool Sealing lip wedge 00 9 316 in set 00 9 310 ASSEMBLY WEDGES (SET IN PLASTIC CASE) .

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 BMW Service Operating Fluids .

Fig 4: Seal And Special Tool (00 9 316)

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

Press piston into cylinder bore.

IMPORTANT: Do not twist brake piston.

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: Dust Sleeve And Piston

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