Removing and installing/replacing brake pads on both front disc brakes (Brembo)

Special tools required: 

• 34 1 050
• 34 1 280

Attention! 

• 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, but rather clean with brake cleaner BMW Tl. number 83 19 2154 780 and apply a thin coating of break pad paste BMW Tl. number 8319 2 158 851 (3 gr.) or 83 19 2158 852 (100 gr.). 

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

Necessary preliminary tasks: 

• Remove FRONT WHEELS .
• Remove BRAKE PAD WEAR SENSOR .

Pull brake pad wear sensor (1) forward out of the brake pad (left side only when replacing brake pads).

Drive out retaining pins (2).

Remove expanding spring (3).

Remove brake pads (4).

Installation note: 

The following installation sequence must be followed. 

• Install new brake pads.
• Align brake pads with the retaining pins in the brake caliper.
• Fully depress brake pedal several times so that brake pads contact brake discs.
• Fit retaining pins and expanding spring.

Attention! 

Mark any worn brake pads.

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

Do not grease backs of brake pads sleeve.

Clean brake pads.

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.

Courtesy of BMW OF NORTH AMERICA, INC.

Courtesy of BMW OF NORTH AMERICA, INC.

Attention! 

New brake pads may only be fitted if the brake disk thickness is greater than the minimum brake disc thickness.

Attention! 

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.

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

Attention! 

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.

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

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

Clean both inner and outer guide surfaces (2) and apply a thin coating of brake pad paste.

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Lightly coat both sides of the contact surface in area (1 and 2) with brake pad paste.

Courtesy of BMW OF NORTH AMERICA, INC.

Lightly coat the brake pad contact surface on both sides in area (1) with brake pad paste.

Courtesy of BMW OF NORTH AMERICA, INC.