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

WARNING: This page is about a different variant/trim than selected.

Notes

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.

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 1: Removing Piston From Connection Bore Using Compressed Air

Courtesy of BMW OF NORTH AMERICA, INC.

Press off dust sleeve (1).

Fig 2: 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.

Fig 3: Removing Seal Using Special Tool (00 9 316)

Courtesy of BMW OF NORTH AMERICA, INC.

Installation:

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

Fit dust sleeve (1) in groove (2) of brake caliper housing and press into the annular groove.

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 4: Identifying Brake Caliper Housing Dust Sleeve On Groove

Courtesy of BMW OF NORTH AMERICA, INC.

Lightly press brake piston against dust sleeve (1).

Inflate dust sleeve with compressed air (max. 2 bar) via the connection hole. Dust sleeve snaps over brake piston.

Installation

Coat dust sleeve and brake piston with brake fluid to facilitate installation of dust sleeve.

Fig 5: Identifying Brake Piston Dust Sleeve With Annular Groove

Courtesy of BMW OF NORTH AMERICA, INC.

Press piston into cylinder bore until dust sleeve (1) snaps into annular groove (2) of brake piston.

IMPORTANT: Do not twist brake piston.