34 41 280 Removing and installing actuator unit with control unit for parking brake (EMF)

Necessary preliminary tasks: 

• Remove BOTH REAR WHEELS .

Delete fault memory.

Check function of actuator unit.

If actuator unit is defective, set diagnosis system to workshop mode.

• Operating procedure: 
  • Perform vehicle identification  .
  • Carry out vehicle test. 
  • Open menu item Actions. 
    • Open Service Function. 
      • Level 1:

        Select menu item:

        02 Chassis and Suspension 

      • Level 2:

        Select menu item:

        Parking Brake 

      • Level 3:

        Select menu item:

        Workshop Mode 

        • List of matches: Activate "AS 3440_L6_EMF" workshop mode  file
        • Procedure/Option: Select menu item:

          1 Set Workshop Mode 

        • Procedure:

          The message Workshop mode has been set  is displayed

Open tailgate.

Fold back luggage compartment floor trim panel (1) as pictured.

Release plastic nuts (2).

Remove luggage compartment floor trim panel (1) in direction of arrow.

Fig 1: Removing Luggage Compartment Floor Trim Panel

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Cable for emergency release (1) must be removed with actuating unit.

Press both detent lugs together and press cable for emergency release (1) downwards.

Fig 2: Pressing Detent Lugs

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Release screw (1) and remove spring clip (2) on left and right.

Installation note: 

Tightening torque 34 41 1AZ .

Fig 3: Identifying Spring Clip And Screw

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Disengage parking brake Bowden cable (1) from holder (2) on right and left.

Replace holder (2).

Fig 4: Identifying Parking Brake Bowden Cable And Holder

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Fig 5: Positioning Screwdriver On Brake Shoe Expander

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Turn brake disc into position as illustrated (arrow).

Position screwdriver (1) on brake shoe expander (2) as illustrated.

Pull up parking brake cable behind hub carrier towards brake shoe expander (2) as far as it will go and hold in position.

At the same time, use a standard screwdriver (3) to press nipple (1) in brake shoe expander (2) downwards as far as possible.

Screwdriver: shank length 40 mm, blade width 4 mm

Pull handbrake cable out of wheel carrier.

Fig 6: Pressing Nipple Using Standard Screwdriver

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Fig 7: Positioning Screwdriver On Brake Shoe Expander

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Installation note: 

Grease nipple of parking brake cable with fitting paste (part number 81 22 9 407 171).

Obtainable via BMW.

Feed parking brake cable horizontally  into brake anchor plate/brake guard plate. Sleeve must be inserted up to stop.

Nipple of handbrake cable must audibly snap into place in expander lock.

Disconnect plug connection (1).

Release screw (2).

Installation note: 

Tightening torque 34 41 3AZ .

Disengage actuator unit (3) in direction of arrow and remove.

Fig 8: Removing Actuator Unit

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Vehicles with HSR and Dynamic Drive: 

RELEASE DYNAMIC DRIVE STABILIZER on rear axle support (removal not necessary).

Slide holder with parking brake actuator unit (2) to the point where screws (1) can be released.

Installation note: 

Tightening torque 34 41 4AZ .

Detach actuator unit from holder (2).

Fig 9: Identifying Parking Brake Actuator Unit And Holder

Courtesy of BMW OF NORTH AMERICA, INC.

Feed through left parking Bowden cable (1) between left rear silencer and rear axle support.

Fig 10: Identifying Parking Bowden Cable Between Left Rear Silencer And Rear Axle Support

Courtesy of BMW OF NORTH AMERICA, INC.

If necessary, release bracket from left rear silencer and gently pull rear silencer downwards.

Feed out parking brake actuator unit (1) between left rear silencer and rear axle support.

Fig 11: Identifying Parking Brake Actuator Unit

Courtesy of BMW OF NORTH AMERICA, INC.

After installation: 

• Carry out initial operation/function test in BMW diagnosis system.
  • Path
    • Activities
    • Service functions
    • Chassis and suspension
    • Parking brake
    • Initial operation/function test

Replacement: 

• Carry out programming/coding of control units
• Carry out parking brake start-up/functional check