Dual Piston

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





Special tools required:
- 00 9 316





Warning!
In the following work step, large forces occur at the brake calliper piston (up to more than

2800 N).

Risk of injury!





Note:
Use repair kit,

refer to BMW Parts Service.





Press off dust sleeve (1).

Installation Note:
Dust sleeve must be correctly seated in groove (2) of piston and groove (3) of brake caliper.

The area between the dust sleeve and the brake calliper 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.





Important!
To protect the pistons, place a protective plate (2) (e.g. hard wood or hard felt) in caliper recess.

Do not grip piston with fingers - risk of trapping!

Check guide sleeves (1), fitting repair-kit guide sleeve if necessary.

Carefully force piston out through connection bore with compressed air.

Installation Note:
Do not jam piston when pressing in.





Important!
Machining of cylinders and pistons is not permitted.

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.

Install new seal.

Installation Note:
Apply a light coat of Ate brake cylinder paste to cylinder bore, piston and seal,

Refer to BMW Service Operating Fluids.