Overhaul

34 11 552 Overhauling Left Or Right Front Brake Calliper (TRW) (Brake Calliper Removed)

Special tools required:







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.







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 calliper recess.
Do not grip piston with fingers - risk of trapping.







Press off dust sleeve (1).







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 BMW Service Operating Fluids.







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

Installation:
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.







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.

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

IMPORTANT: Do not twist brake piston.