34 11 000 Removing and installing/replacing brake linings on both front disk brakes

WARNING: This page is about a different car, the 2005 BMW 645Ci and 2004 BMW 645Ci. However, it is still accessible from the selected car via links, so may be relevant.

Special tools required:

34 1 080
34 6 320

Necessary preliminary tasks:

Remove wheels, refer to 36 10 300 REMOVING OR INSTALLING FRONT OR REAR WHEEL .

Observe safety instructions on raising the vehicle, refer to 00 .. ... LIFTING VEHICLE WITH A LIFTING PLATFORM .

If necessary, when replacing linings, reset CBS display in accordance with factory specification.

NOTE: After completing work:

Fully depress brake pedal several times so that brake linings contact brake disks.
When installing new brake linings at front and rear axles, brake fluid level must be brought up to "MAX" marking.

Lever out retaining spring (1) in direction of arrow towards rear.

Installation:

Attach retaining spring (1) first at top and bottom and then allow retaining lug (2) to engage in recess of brake caliper housing.

Fig 1: Removing Retaining Spring

Courtesy of BMW OF NORTH AMERICA, INC.

Remove plastic plugs (1). Lift brake hose out of bracket.

Fig 2: Removing Plastic Plugs

Courtesy of BMW OF NORTH AMERICA, INC.

Left:

Pull brake lining wear sensor (1) towards rear out of lining. If necessary, replace brake lining wear sensor, refer to 34 35 001 REPLACING A BRAKE LINING SENSOR .

Release guide screws (2) with special tool 34 1 080. Withdraw brake caliper backwards.

Installation:

Only clean guide screws; do not grease.

Check threads.

Replace all guide screws which are not in perfect condition. Tightening torque, refer to 34 11 3AZ in BRAKES - TIGHTENING TORQUES - 645CI .

Fig 3: Removing Brake Lining Wear Sensor

Courtesy of BMW OF NORTH AMERICA, INC.

Press back brake linings and piston with special tool 34 6 320.

IMPORTANT: When forcing piston back:

Pay attention to brake fluid level in expansion tank; brake fluid that spills over will damage paintwork.

Fig 4: Pressing Brake Linings And Piston With Special Tool 34 6 320

Courtesy of BMW OF NORTH AMERICA, INC.

Press brake linings inwards and remove.

The two brake linings are seated with a spring in the piston or in the brake caliper housing and must not be mixed up.

IMPORTANT: Mark any worn brake linings.

In the event of one-sided brake lining wear, do not change brake linings round.

New brake linings may only be installed if the brake disk thickness is greater than or equal to the minimum brake disk thickness (MIN TH).

Observe minimum brake disk thickness of brake linings, refer to BRAKES - TECHNICAL DATA .

Clean brake linings, refer to 34 11 000 REMOVING AND INSTALLING/REPLACING BRAKE LININGS ON BOTH FRONT DISK BRAKES .

Do not apply grease to brake pad backplate. Check dust sleeve (1) for damage and replace if necessary. Clean contact face (2) of brake piston and apply a thin coating of anti-squeak compound.

Fig 5: Identifying Dust Sleeve (1)

Courtesy of BMW OF NORTH AMERICA, INC.

IMPORTANT: Dust sleeve must not come into contact with anti-squeak compound as this may cause the dust sleeve to swell.

Fig 6: Checking Dust Sleeve And Cleaning Contact Face

Courtesy of BMW OF NORTH AMERICA, INC.

Clean mounting faces (1) and (2) of brake lining hammer heads/brake caliper housing and coat with anti-squeak compound.

Fig 7: Cleaning Brake Lining Hammer Heads/Brake Caliper Housing Mounting Face

Courtesy of BMW OF NORTH AMERICA, INC.

NOTE: Grease contact surfaces on brake caliper at top and bottom.

Clean mounting face (3) of brake caliper and apply a thin coating of anti-squeak compound.

Fig 8: Cleaning Brake Caliper Mounting Face

Courtesy of BMW OF NORTH AMERICA, INC.

Clean brake caliper holder at hammerhead guides and apply a thin coating of anti-squeak compound.

Refer to OPERATING FLUIDS - BRAKES .

Fig 9: Cleaning Brake Caliper Holder At Hammerhead Guides

Courtesy of BMW OF NORTH AMERICA, INC.