Overhaul

34 11 552 - Overhauling front left or right brake caliper





Special tools required:
- 34 6 302 34 6 300 Brake Piston Tool
- 34 6 304 34 6 300 Brake Piston Tool
- 34 6 305 34 6 300 Brake Piston Tool





Necessary preliminary tasks:
- Remove brake caliper Removing and Installing/Replacing Left or Right Front Brake Caliper.

Important!
Use repair kit as specified by BMW Parts Service.





Remove both brake pads.
Note: The inner brake pad is held by a spring in the piston.





Carefully remove dust sleeve.





Warning!
In the following work step, large forces occur at the brake caliper piston (up to more than 2800 N).
Danger of injury!





Carefully force piston out through connection bore with compressed air.
Fit a protective plate (e.g. hard wood or hard felt) in the caliper well to protect the piston.
Do NOT grip piston with fingers - risk of trapping!





Check guide sleeves (1) and fit repair kit guide sleeves if necessary.





Carefully remove sealing ring with a plastic needle.
Clean cylinder bores and parts with alcohol and dry with compressed air.
Thoroughly check cylinder bore, piston and flange faces.

Important!
Machining of cylinders and pistons is not permitted.





Installation Note:
Apply a thin coat of ATE brake cylinder paste to cylinder bore, piston and sealing sleeve,
Refer to BMW Operating Fluids.

Install sealing cover (1) in annular groove of cylinder bore.





Fit dust sleeve (1).
Using a commercially available extension and socket, carefully press brake piston into the bore.





Make sure the dust guard is free of grease and brake fluid.
Use special tools 34 6 302 34 6 300 Brake Piston Tool, 34 6 304 34 6 300 Brake Piston Tool and 34 6 305 34 6 300 Brake Piston Tool to fit dust guard on brake caliper.