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

WARNING: This page is about a different variant/trim than selected.

Special tools required:

34 1 050
34 1 280

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!

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 (3 g) or 83 19 2 158 852 (100 g).

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 brake pad wear sensor (1) towards front out of pad (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:

Replace guide screw.

Tightening torque 34 11 3AZ

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

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

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 .

Clean brake pads.

Do not apply grease to brake pad backplate.

Fig 2: 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 .

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).

Fig 3: Identifying Measuring Points

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NOTE: The minimum thickness of the brake disc is designed so that it holds over the service life of a further set of brake pads if it is greater than or equal to the MINIMUM BRAKE DISC THICKNESS (MIN TH).

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 4: Identifying Special Tool 34 1 050

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Check dust boot for damage and renew 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 5: Identifying Contact Surface Of Brake Piston

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

Fig 6: Identifying Contact Surface Of Brake Caliper

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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 7: Identifying 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 8: Identifying Paste Application Area

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

Fig 9: Identifying Brake Pad With Indentation

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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 BREAKING IN NEW BRAKE DISCS / BRAKE PADS .
If necessary, when replacing pads, reset CBS display in accordance with factory specification.

Replacement:

Remove pad retaining springs (1).

Installation note:

So as not to damage the surface coating, if possible do not mechanically clean the guide surfaces (1) 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 10: Identifying Pad Retaining Springs

Courtesy of BMW OF NORTH AMERICA, INC.