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

Special tools required: 

• 00 9 316

Check guide sleeves (1). If necessary, fit repair kit guide sleeve.

Fig 1: Identifying Guide Sleeves

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Carefully force piston out through connecting bore (1) with compressed air.

To protect piston, place a protective plate (2) (e.g. hard wood or hardened felt) in caliper recess.

Do not grip piston with fingers - pinch hazard!

Fig 2: Removing Piston From Connecting Bore Using Compressed Air

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Press off dust boot (1).

Fig 3: Identifying Dust Boot

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Carefully remove sealing ring (1) special tool 00 9 316 .

Clean cylinder bores and parts with spirits and dry with compressed air.

Thoroughly inspect cylinder bore, piston and flange surfaces for damage. Machining of cylinders and pistons is not permitted.

Install new sealing ring.

Installation note: 

Apply a light coat of Ate brake cylinder paste to cylinder bore, piston and sealing ring.

Fig 4: Identifying Sealing Ring

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

Press piston into cylinder bore.

Evenly press dust boot (1) onto brake caliper housing (3) to the limit position.

Installation note: 

Fig 5: Identifying Dust Boot, Piston And Brake Caliper Housing

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The area between the dust boot and the brake caliper housing (3) 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 boot is perfectly fitted.