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Home >> BMW >> 2009 >> M3 2D Convertible, Automatic DCT >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 67 (Brakes - Repair - E90) >> Front Brakes >> 34 11 000 Removing and installing/replacing brake pads on both front disc brakes (M3)

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

WARNING: This page is about a different variant/trim than selected.
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. 83 19 2 158 851.
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 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 work 

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

Installation note: 

Replace retaining spring (1).

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
G04742620Courtesy of BMW OF NORTH AMERICA, INC.

Remove plastic plugs (1).

Fig 2: Identifying Plastic Plugs
G06203987Courtesy 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 BIT INSERT . Withdraw brake caliper backwards.

Installation note: 

Only clean guide bolts; do not grease.

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

Check threads.

Replace all guide bolts which are not in perfect condition.

Tightening torque 34 11 4AZ .

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

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

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 lining backplate.

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) of brake piston 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 Caliper Housing Contact Surface
G04754175Courtesy of BMW OF NORTH AMERICA, INC.
IMPORTANT:
  • Do not grease contact surface (1).
  • Clean contact surface (1) with brake cleaner.

    Contact surface must be free from oil and grease.

Fig 9: Identifying Contact Surface With Brake Cleaner
G06203994Courtesy of BMW OF NORTH AMERICA, INC.

Brake pad with adhesive film must be installed in each case on the outside in direction of travel!

Detach protective film (1) from brake pad and install pad.

Fig 10: Identifying Protective Film Of Brake Pad
G06203995Courtesy 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 11: Identifying Brake Pads Guide Surfaces On Brake Caliper Mounting Bracket
G04754177Courtesy of BMW OF NORTH AMERICA, INC.

So as not to damage the surface coating, if possible do not mechanically clean  pad guides (1). Instead, clean with brake cleaner and apply a thin coating of brake pad paste.

Fig 12: Identifying Brake Pad Guides
G04794699Courtesy 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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