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

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Special tools required:

34 1 050
34 1 280

IMPORTANT:

Do not mechanically clean the guide surfaces for brake pads to prevent damage to the surface coating. Clean the guide surfaces using brake cleaner, part number 83 19 2 154 780. Carefully clean severely soiled guide surfaces with a suitable tool (e.g. brass wire brush, nylon brush). Then thinly coat with brake pad paste, part number 83 19 2 158 851 (3 gr.) or 83 19 2 158 852 (100 gr.).
Spread brake pad paste onto the marked surfaces using a brush!

Observe instructions for APPLYING BRAKE PAD PASTE to brake pads and caliper carriers!
Retaining pins and expanding spring: for vehicles older than 48 months it is recommended to replace the retaining spring!
Brake pad wear sensor: After removal it must be replaced (brake pad wear sensor loses its retention capability in the break pad).
A CBS reset is mandatory upon every brake pad exchange if:
- the brake pad wear sensor is partially ground (display in CBS menu): CBS reset possible within the vehicle.
- the brake pad wear sensor is not partially ground: CBS reset possible via diagnosis system only.

Necessary preliminary tasks:

Remove FRONT WHEELS .
Remove BRAKE PAD WEAR SENSOR .

Removal:

Release guide screw (1).

If necessary, grip at hexagon head (2).

Tilt brake caliper (3) upwards.

Fig 1: Brake Caliper Parts Location

Courtesy of BMW OF NORTH AMERICA, INC.

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, do not change brake pads round.

Observe MINIMUM THICKNESS of brake pads.

Fig 2: Removing Brake Pads

Courtesy of BMW OF NORTH AMERICA, INC.

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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Installation:

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).

Fig 4: Bevel Dimension

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These procedures applies for all the following described brake systems.

Fig 5: Pressing Brake Piston With Special Tool

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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.

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: Cleaning Contact Surface Of Brake Piston With Brake Cleaner

Courtesy of BMW OF NORTH AMERICA, INC.

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

Fig 7: Cleaning Contact Surface Of Brake Caliper With Brake Cleaner

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So as not to damage the surface coating, if possible do not mechanically clean the guide surface (1) for the brake pads on the brake caliper mounting bracket. Clean guide surface (1) with brake cleaner and apply a thin coating of brake pad paste.

Fig 8: Guide Surface For Brake Pads

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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: Applying Thin Coating Of Brake Pad Paste To Both Sides Of T-Head Of Brake Pad In Area

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

Fig 10: Locating Bulge Of Brake Pad

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Replacement:

Replace lining spring (1).

Fig 11: Lining Spring

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Install brake pad (1) in the caliper carrier in direction of arrow.

Fig 12: Installing Brake Pad In Caliper Carrier

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Tilt brake caliper (3) down.

Insert guide bolt (1) and tighten.

If necessary, grip at hexagon head (2).

Installation note:

Replace guide screw.

Tightening torque 34 11 3AZ .

Fig 13: Brake Caliper Parts Location

Courtesy of BMW OF NORTH AMERICA, INC.

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 .