34 21 320 Removing and installing/replacing both rear brake discs (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 1 280

Necessary preliminary tasks: Remove WHEELS . After completing work: Adjusting parking brake . Read and comply with notes on braking in new brake discs / brake pads .

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. If the brake discs are replaced, you must also fit new brake pads. Always replace brake discs in pairs.

Fig 1: 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).

Release bolts (1) and pull off brake caliper towards front. Important! Tie brake caliper back and do not allow to hang from brake hose. Installation: Replace screws. Tightening torque 34 21 2AZ .

Fig 2: Locating Brake Caliper Bolts

Courtesy of BMW OF NORTH AMERICA, INC.

Important! To release brake disc: Do not under any circumstances strike friction ring with a hammer or similar! If necessary, carefully tap on base of brake disc chamber with a rubber mallet. Clean contact surface of brake disc at wheel hub thoroughly and remove traces of corrosion. Unevenness on contact surface may result in distortion of brake disc!

Fig 3: Identifying Brake Disc And Screw

Courtesy of BMW OF NORTH AMERICA, INC.

Release screw (1) and remove brake disc (2). Installation: Replace screw. Tightening torque 34 21 1AZ .