Parking Brake Actuator: Service and Repair
34 41 280 Removing and installing/replacing actuator unit with control unit for parking brake (EMF)
Necessary preliminary work:
^ Remove both rear wheels
Important!
The following work must only be carried out with the BMW ISID diagnosis system with software version 02.18 or later.
Delete fault memory.
Check function of actuator unit.
If actuator unit is defective, set BMW 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:
Select file "ABL S3440 L4 WKM" - Workshop mode
- Procedure/Option:
Select menu item:
1 Set Workshop Mode
- Procedure:
The message Workshop mode has been set is displayed
Replacement:
If workshop mode cannot be set for the EMF actuator unit, the cables must be released using the emergency release.
Open flap in luggage compartment at rear left.
Remove first aid kit (1).
Cable for emergency release (1) must be removed with actuator unit.
Press both retaining lugs together and press cable for emergency release (1) downwards.
Unclip cable for emergency release from guides on rear axle.
Dynamic Drive:
Release screws (1) and remove heat shield (2).
Release stabilizer at bearing points and swing downwards.
Release screw (1) and remove spring clip (2) on left and right.
Installation Note:
Tightening torque 34 41 1AZ.
Disengage parking brake Bowden cable (1) from holders on left and right.
Version 1:
Turn brake disc into position as illustrated (arrow).
Position screwdriver (1) on brake shoe expander (2) as illustrated.
Note:
For greater clarity, illustration does not show brake disc.
Pull up parking brake Bowden cable behind wheel 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) upwards as far as possible.
Screwdriver: shank length 40 mm, blade width 4 mm
Pull parking brake Bowden cable out of wheel carrier.
Note:
Bowden cable must not be pulled out before lifting the nipple (1).
Version 2:
Turn brake disc into position as illustrated (arrow).
Position screwdriver (1) on brake shoe expander (2) as illustrated.
Note:
For greater clarity, illustration does not show brake disc.
Pull up parking brake Bowden cable behind wheel 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 parking brake Bowden cable out of wheel carrier.
Note:
The Bowden cable must not be pulled out before the nipple (1) has been pushed down as far as possible.
Installation Note:
Grease nipple of parking brake Bowden cable with assembly paste (part number 81 22 9 407 171).
Obtainable from BMW Parts Department.
Feed parking brake Bowden cable horizontally into brake anchor plate/brake guard plate. Sleeve must be inserted up to stop.
Nipple of parking brake Bowden cable must audibly snap into place in brake shoe expander.
Disconnect plug connection (1).
Unfasten screws (2).
Installation Note:
Tightening torque 34 41 4AZ.
Undo bolts (3) and remove holder (4).
Installation Note:
Tightening torque 34 41 3AZ.
Manoeuvre out actuator unit together with parking brake Bowden cables and cable for emergency release.
After installation:
^ Carry out initial operation/functional check in BMW diagnosis system.
^ Path
- Activities
- Service functions
- Chassis and suspension
- Parking brake
- Initial operation/functional check
Replacement:
^ Carry out programming/coding of control units
^ Carry out parking brake initial operation/functional check
