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

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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 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). Spread brake pad paste onto the marked surfaces using a brush! Observe instructions for APPLYING BRAKE PAD PASTE TO BRAKE PADS AND BRAKE ANCHOR PLATES !

Necessary preliminary tasks:

Remove FRONT WHEELS .
Remove BRAKE PAD WEAR SENSOR .

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" marking.
Read and comply with notes on BREAKING-IN new brake discs/brake pads.
When replacing pads, reset CBS display in accordance with factory specification.

Lever out retaining spring (1) in direction of arrow towards rear.

Installation note:

Place retaining spring (1) first at top and bottom of brake caliper and then allow to engage in recess (2) of brake caliper housing.

Fig 1: Identifying Retaining Spring And Recess

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Remove plastic plugs (1).

Fig 2: Identifying Plastic Plugs

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Unscrew guide bolts (1).

IMPORTANT: Tie brake caliper back and do not allow to hang from brake hose.

Withdraw brake caliper backwards.

Installation note:

Only clean guide bolts; do not grease.

Check threads.

Replace all guide bolts which are not in perfect condition.

Tightening torque 34 11 4AZ .

Fig 3: Identifying Guide Bolts

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IMPORTANT: Mark any worn brake pads.

Remove brake pads in direction of arrow.

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

Observe MINIMUM THICKNESS OF BRAKE PADS .

Clean brake pads.

Fig 4: Removing Brake Pads

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IMPORTANT: Mark any worn brake pads.

For equipment specification high-speed brake system:

Remove brake pads in direction of arrow.

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 lining backplate.

Fig 5: Removing Brake Pads

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IMPORTANT: When forcing piston back:

Pay attention to brake fluid level in expansion tank; brake fluid that spills over will damage paintwork.

Press back brake pads and piston with special tool 34 1 050 .

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 6: Pressing Back Brake Pads And Piston Using Special Tool (34 1 050)
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IMPORTANT: New brake pads may only be fitted if the brake disc thickness is greater than the MINIMUM BRAKE DISC THICKNESS (MIN TH) .

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 7: Identifying Brake Piston Contact Surface

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Clean contact surfaces (1) of T-heads/brake caliper housing with brake cleaner and apply a thin coating of brake pad paste.

Fig 8: Identifying Contact Surfaces Of T-Heads/Brake Caliper Housing

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

Fig 9: 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 surfaces (1) for the brake pads on the brake caliper mounting bracket. Clean guide surfaces (1) with brake cleaner and apply a thin coating of brake pad paste.

Fig 10: Identifying Guide Surfaces

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So as not to damage the surface coating, if possible do not mechanically clean the guide surfaces (1 and 2) for the brake pads on the brake caliper mounting bracket. Clean guide surfaces (1 and 2) with brake cleaner and apply a thin coating of brake pad paste.

Fig 11: Identifying Guide Surfaces

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Lightly coat the T-head of the inner brake pad with brake pad paste in area (1 and 2).

Fig 12: Coating T-Head Of Inner Brake Pad With Brake Pad Paste

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Lightly coat the T-head of the outer brake pad with brake pad paste in area (1 and 2).

Fig 13: Coating T-Head Of Outer Brake Pad With Brake Pad Paste

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