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

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 pins and expanding spring: for vehicles older than 48 months it is recommended to replace the retaining spring.

IMPORTANT:

So as not to damage the surface coating, do not mechanically clean the guide surfaces for the brake pads on the caliper mounting bracket, if possible.

Instead, clean with brake cleaner, part number 83 19 2 154 780, and apply a thin coating of break pad paste, part number 83 19 2 158 851 (3g) or 83 19 2 158 852 (100g).

Spread brake pad paste onto the marked surfaces using a brush.

Observe GUIDELINE FOR APPLYING BRAKE PAD PASTE ON BRAKE PADS AND BRAKE ANCHOR PLATE .

Necessary preliminary tasks:

Remove FRONT WHEELS .
Remove BRAKE PAD WEAR SENSOR .

Pull the brake pad wear sensor (1) toward the front out of the brake bad (left side only).

Release guide screw (3).

If necessary, grip at hexagon head (2).

Feed brake hose out of holder (4).

Tilt brake caliper upwards.

Installation note:

Replace guide screw.

Fig 1: Identifying Brake Pad Wear Sensor, Guide Bolt, Hexagon Head And Holder

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Tightening torque 34 11 3AZ .

Remove brake pads (1) in direction of arrow from caliper carrier.

IMPORTANT:

Mark any worn brake pads.

In the event of one-sided brake pad wear, replacement of all brake pads is not necessary.

Observe MINIMUM THICKNESS OF BRAKE PADS .

Clean brake pads.

Fig 2: Removing Brake Pads From Caliper Carrier

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Do not apply grease to brake lining backplate.

Check minimum brake disc thickness:

Position special tool 34 1 280 at three measuring points in area (1) and measure.
Compare measuring result and lowest value with SETPOINT VALUE .

Fig 3: Checking Minimum Brake Disc Thickness

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IMPORTANT:

New brake pads may only be installed if the brake disk thickness is greater than the MINIMUM BRAKE DISC THICKNESS .

If new brake pads are mounted on a brake disc, the following must be observed:

Bevel edges in the area (1) slightly (dimension A must not exceed maximum 1 mm).

These procedures applies for all the following described brake systems.

Fig 4: Locating Bevel Edges

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Press brake piston fully back with special tool 34 1 050 .

IMPORTANT:

When pressing piston back, note brake fluid level in expansion tank.

Overflowing brake fluid will damage the paintwork.

Fig 5: Pressing Brake Piston Using Special Tool (34 1 050)

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Check dust boot for damage and replace if necessary.

Clean contact surface (1) 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 6: Brake Piston Contact Surface

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Clean contact surface (1) of brake caliper with brake cleaner and apply a thin coating of brake pad paste.

Fig 7: Brake Caliper Contact Surface

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IMPORTANT:

So as not to damage the surface coating, do not mechanically clean the guide surfaces for the brake pads on the caliper mounting bracket, if possible.

Instead, clean guide surfaces with brake cleaner and apply a thin coating of brake pad paste.

Fig 8: Guide Surface For Brake Pads On Brake Caliper Mounting Bracket

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Apply a thin coating of brake pad paste to both sides of T-head of brake pad in area (1).

Fig 9: Identifying Brake Pad Paste Application Area On Both Sides Of T-Head

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IMPORTANT: Brake pad with bulge (1) is intended for accommodating the brake pad wear sensor and must be fitted on the piston side.

Fig 10: Brake Pad With Wear Sensor Bulge

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NOTE: After completing repair 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" mark.
Read and comply with notes on BREAKING IN NEW BRAKE DISCS/BRAKE PADS .
If necessary, when replacing brake pads, reset CBS display as per factory specification.

Replacement:

Remove lining spring (1) and replace.

Installation note:

IMPORTANT:

So as not to damage the surface coating, do not mechanically clean the guide surfaces for the brake pads on the caliper mounting bracket, if possible.

Instead, clean guide surfaces with brake cleaner and apply a thin coating of brake pad paste.

Fig 11: Identifying Lining Spring

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