IMPORTANT: The brake pad wear sensor must be replaced once it has been removed (brake pad wear sensor loses its retention capability in the brake pad).
If an already ground brake pad wear sensor has to be replaced although the minimum brake pad thickness has not yet been reached, it is necessary to file down the new sliding contact with a file to the same length as the ground sliding contact.
Necessary preliminary work:
Unclip line from holder (1).
Open housing cover.
Disconnect plug connection (2).
Installation note: Make sure the plug connections snaps in correctly and the line is fitted correctly in the holders.
Unclip line from holders (1).
Installation note: Ensure proper locking of the holders and proper seating of the line in the holders.
Disengage line from brake pad wear sensor from holder (1).
Pull brake pad wear sensor (2) in direction of arrow out of brake pad.
Installation note: Make sure brake pad wear sensor (2) is correctly seated in brake pad and holder (1).
BMW X3 Service & Repair Manual > Rear brakes: Guideline for applying brake pad paste on brake pads and brake anchor plate
IMPORTANT:
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 and apply a thin coating of brake pad paste BMW part
no. 83 ...