34 21 812 Overhauling left or right rear brake caliper (brake caliper removed)

Special tools required: 

• 00 9 316 

See BRAKES - SPECIAL TOOLS .

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

Fig 1: Identifying 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: Placing Protective Plate In Caliper

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Press off dust sleeve (1).

Fig 3: Identifying Dust Sleeve

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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)

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

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: Pressing Dust Sleeve Onto Brake Caliper Housing

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