34 21 812 Overhauling Left Or Right Rear Brake Caliper (Brake Caliper Removed)

WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2007 BMW 760Li, 2006 BMW 760i, 2006 BMW 760Li, 2005 BMW 760i, and 2005 BMW 760Li. However, it is still accessible from the selected car via links, so may be relevant.

NOTE:

For Special Tool identification, see BRAKES - SPECIAL TOOLS .

Special Tools Required:

34 1 132

NOTE: Use original BMW repair kit.

Take off plastic caps (1).

Unscrew guide screws (2).

Installation:

Only clean guide screws; do not grease. Check guide bolts, replace if necessary.

Tightening torque, refer to 34 21 5AZ in BRAKES - TIGHTENING TORQUES .

Fig 1: Identifying Guide Screws And Plastic Caps

Courtesy of BMW OF NORTH AMERICA, INC.

Dismantle brake caliper and remove brake linings.

Installation:

Press brake lining fully outwards and insert springs (4).

Fig 2: Locating Brake Spring

Courtesy of BMW OF NORTH AMERICA, INC.

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

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 3: Removing Piston Through Connection Bore

Courtesy of BMW OF NORTH AMERICA, INC.

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

Fig 4: Identifying Guide Sleeves

Courtesy of BMW OF NORTH AMERICA, INC.

Remove sealing ring carefully with a plastic needle.

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.

Fig 5: Removing Sealing Ring Using Plastic Needle

Courtesy of BMW OF NORTH AMERICA, INC.

Installation:

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

Refer to OPERATING FLUIDS - BRAKES .

Install sealing cover in rear annular groove of cylinder bore. Press in piston with a hardwood board.

IMPORTANT: Do not tilt piston.

Fig 6: View Of Brake Piston

Courtesy of BMW OF NORTH AMERICA, INC.

Press on dust protection sleeve evenly up to stop with special tool 34 1 132.

Installation:

The area between dust protection sleeve and brake caliper housing must be kept dry so as to ensure correct seating for the dust protection sleeve.

Keep Ate brake cylinder paste or brake fluid away from this area.

Make sure dust protection sleeve is correctly seated on piston.

Fig 7: Locating Dust Protection Sleeve

Courtesy of BMW OF NORTH AMERICA, INC.