34 21 200 Removing and installing/replacing brake pads on both rear disc brakes (Brembo)

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2013 BMW 128i, 2012 BMW 128i, 2011 BMW 128i, 2010 BMW 128i, and 2009 BMW 128i. However, it is still accessible from the selected car via links, so may be relevant.

Special tools required: 34 1 000 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 .

Necessary preliminary tasks: Remove WHEELS . Remove brake pad wear sensor.

Drive out retaining pins (1). Remove expanding spring (2). Pull out brake pads (3) with special tool 34 1 000 .

Fig 1: Identifying Retaining Pins, Expanding Spring And Brake Pads

Courtesy of BMW OF NORTH AMERICA, INC.

Important! Mark any worn brake pads. In the event of one-sided brake pad wear, do not change brake pads round.

Clean brake pads. Do not grease backs of brake pads sleeve.

Important! When pressing down piston, note brake fluid level in expansion tank. Overflowing brake fluid will damage the paintwork.

Turn piston back fully with special tool 34 1 050 .

Fig 2: Turning Piston Back Using Special Tool

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 measurement result and lowest value with setpoint value.

Fig 3: Identifying Special Tool (34 1 280)

Courtesy of BMW OF NORTH AMERICA, INC.

Important! New brake pads may only be fitted if the brake disc thickness is greater than the minimum brake disc thickness (MIN TH).

Important! Do not grease brake pads and guides with brake pad paste.

Clean brake caliper. Check dust boot (1) for damage and replace if necessary. Clean contact surface (2) of brake piston.

Fig 4: Identifying Dust Boot And Contact Surface

Courtesy of BMW OF NORTH AMERICA, INC.

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 braking in new brake discs / brake pads .

When replacing pads, reset CBS display in accordance with factory specification.