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

Special tools required: 

• 34 1 080
• 34 1 280
• 34 6 320

• 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 

Observe SAFETY INSTRUCTIONS on raising the vehicle.

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

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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 3AZ .

Fig 3: Identifying Guide Screws

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

Fig 4: Identifying Special Tool (34 6 320) On Back Brake Pads And Piston

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

Observe MINIMUM THICKNESS OF BRAKE PADS .

Clean brake pads.

Do not apply grease to brake pad backplate.

Fig 5: Locating Mark On 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 .

Fig 6: Checking Minimum Brake Disc Thickness

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New brake pads may only be installed if the brake disc thickness is greater than or equal to the MINIMUM BRAKE DISC THICKNESS (MIN TH) (not incl. M vehicles).

In the case of M vehicles and perforated brake discs, new brake pads may only be installed if the brake disc thickness is greater than the MINIMUM BRAKE DISC THICKNESS (MIN TH).

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 7: Identifying Dust Sleeve And Contact Face Of Brake Piston

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

Fig 8: Identifying Grease Applying Area On Brake Caliper

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

Fig 9: Identifying Mounting Face Of Brake Caliper

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

Fig 10: Locating Brake Caliper Holder

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