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Home >> BMW >> 2009 >> 335d >> Repair and Diagnosis >> Brakes >> Mechanical - Hydraulic >> Brakes - Repair >> 3411 Front brakes >> 34 11 000 Removing and installing/replacing brake pads on both front disc brakes (N54/M57T2 Top/N57/M3)

34 11 000 Removing and installing/replacing brake pads on both front disc brakes (N54/M57T2 Top/N57/M3)

Special tools required 

IMPORTANT:
  • Brake pad wear sensor: after removal it must be replaced (brake pad wear sensor loses its retention capability in the break pad).
  • Retaining spring: for vehicles older than 48 months it is recommended to replace the retaining spring!

So as not to damage the surface coating, if possible do not mechanically clean the guide surfaces for the brake pads on the brake caliper mounting bracket. Instead, clean with brake cleaner BMW part no. 83 19 2 154 780 and apply a thin coating of brake pad paste BMW part no. 81 22 9 407 103.

IMPORTANT: European version only.
Sport brake pads for M3:
  • Due to the increased strain on the brake discs, we recommend that you also replace the brake discs when fitting a new set of brake pads
  • It is absolutely essential to replace the brake discs if cracked ≥ 13 mm even before the brake pad is worn

Necessary preliminary tasks 

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: Identifying Retaining Spring And Retaining Lug
G04742620Courtesy of BMW OF NORTH AMERICA, INC.

Remove plastic plugs (1).

Fig 2: Identifying Plastic Plugs
G04742621Courtesy of BMW OF NORTH AMERICA, INC.

Left:

Pull brake pad wear sensor (1) towards rear out of pad.

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

Installation: 

Only clean guide bolts; do not grease.

Check threads.

Fig 3: Pulling Brake Pad Wear Sensor
G05476857Courtesy of BMW OF NORTH AMERICA, INC.

Replace all guide screws which are not in perfect condition.

Tightening torque 34 11 4AZ .

Press back brake pads 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 Back Brake Pads And Piston
G04742623Courtesy of BMW OF NORTH AMERICA, INC.

Press brake pads inwards and remove.

The two brake pads 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 pads.

In the event of one-sided brake pad wear, do not change brake pads round.

Observe MINIMUM THICKNESS OF BRAKE LININGS .

Clean brake pads.

Do not apply grease to brake pad backplate.

Fig 5: Identifying Brake Pads
G04742624Courtesy of BMW OF NORTH AMERICA, INC.

Check minimum brake disc thickness:

Fig 6: Checking Minimum Brake Disc Thickness Using Special Tool (34 1 280)
G04726574Courtesy of BMW OF NORTH AMERICA, INC.
IMPORTANT: New brake pads may only be fitted if the brake disc thickness is greater than the MINIMUM BRAKE DISC THICKNESS (MIN TH).

Check dust boot (1) for damage and replace if necessary.

Clean contact surface (2) with brake cleaner and apply a thin coating of brake pad paste.

IMPORTANT: Dust boot must not come into contact with brake pad paste as this may cause the dust boot to swell.
Fig 7: Identifying Dust Boot And Brake Pad Contact Surface
G05476861Courtesy of BMW OF NORTH AMERICA, INC.

Clean contact surfaces (1) and (2) of brake pad tee heads/brake caliper housing with brake cleaner and apply a thin coating of brake pad paste.

NOTE: Grease contact surfaces on brake caliper at top and bottom.
Fig 8: Identifying Brake Pad Contact Surfaces
G04726587Courtesy of BMW OF NORTH AMERICA, INC.

Clean contact surface of brake pads (3) with brake cleaner and apply a thin coating of brake pad paste.

Fig 9: Identifying Brake Pads Contact Surface
G04754176Courtesy of BMW OF NORTH AMERICA, INC.

So as not to damage the surface coating, if possible do not mechanically clean the guide surfaces for the brake pads on the brake caliper mounting bracket. Instead, clean with brake cleaner and apply a thin coating of brake pad paste.

Fig 10: Locating Brake Pads On Brake Caliper Mounting Bracket
G04754177Courtesy of BMW OF NORTH AMERICA, INC.
NOTE: After completing work:
  • Fully depress brake pedal several times so that brake pads contact brake discs.
  • When installing new brake pads at front and rear axles, brake fluid level must be brought up to "MAX" marking.
  • Read and comply with notes on BRAKING IN NEW BRAKE DISCS/BRAKE PADS  .
  • If necessary, when replacing pads, reset CBS display in accordance with factory specification.
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