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

Special tools required: 

• 34 1 080 
• 34 1 280 
• 34 6 320 

See BRAKES - SPECIAL TOOLS .

• Due to the increased strain on the brake discs, we recommend that you also replace the brake discs   when fitting this brake pad
• It is absolutely essential to replace the brake discs   if cracked ≥ 13 mm even before the brake pad is worn

Necessary preliminary tasks: 

• Remove wheels  .
• Remove brake pad wear sensor  

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

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Remove plastic plugs (1).

Fig 2: Identifying Plastic Plugs

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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 screws; do not grease.

Check threads.

Replace all guide screws which are not in perfect condition.

Tightening torque 34 11 4AZ  . See 34 11 FRONT BRAKE .

Fig 3: Identifying Brake Pad Wear Sensor

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

Fig 4: Pressing Back Brake Pads And Piston With Special Tool

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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.

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

Observe minimum thickness of brake linings  . See BRAKES - TECHNICAL DATA .

Clean brake pads.

Do not apply grease to brake pad backplate.

Fig 5: Identifying Brake Pads

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Check minimum brake disc thickness:

• Position special tool 34 1 280  at three measuring points in area (1) and measure.
• Compare measurement result and lowest value with setpoint value  . See BRAKES - TECHNICAL DATA .

Fig 6: Checking Brake Disc Thickness

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Check dust sleeve (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  .

Fig 7: Identifying Dust Sleeve And Contact Surface

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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  .

Fig 8: Identifying Contact Surfaces Of Brake Pad Tee Heads/Brake Caliper Housing

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Fig 9: Identifying Contact Surface

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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

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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 holder. Instead, clean with brake cleaner  and apply a thin coating of Never Seez Compound brake pad paste.

Fig 11: Identifying Brake Caliper Holder

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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 Never Seez Compound brake pad paste.

Fig 12: Identifying Pad Guides

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