BMW F12 2011, Technical Training Manual, Page: 32 / 68

F12�Chassis�Dynamics
4.�Brakes
28
F12�Electromechanical�parking�brake�EMF�applied�with�new�brake�pads
Index Explanation
1 Drive�belt
2 Planetary�gears
3 Brake�piston
4 Dust�boot
5 Sealing�ring
6 Spindle�nut
7 Electric�motor
8 Spindle
9 Roller�bearing
10 Sealing�ring
11 Housing
The�driver�applies�the�vehicle's�parking�brake�by�pulling�out�the�parking�brake�button.�The�operating
direction�is�the�same�as�for�a�mechanical�parking�brake�lever.�The�signal�from�the�parking�brake�button
is�imported�by�the�EMF�control�unit.�The�EMF�actuators�on�the�rear�brake�calipers�are�individually�con-
trolled�by�the�EMF�control�unit.
The�parking�brake�can�be�applied�in�any�logical�terminal�status.�The�connection�from�terminal�30�to
the�EMF�control�unit�makes�it�possible�to�apply�the�parking�brake�at�terminal�0.�The�EMF�control�unit
wakes�up�if�the�driver�operates�the�parking�brake�button�at�terminal�0.�The�EMF�control�unit�then
wakes�up�the�other�control�units�in�the�vehicle.�Only�then�does�the�EMF�control�unit�receive�the�essen-
tial�information�about�vehicle�standstill.�In�addition,�the�change�of�parking�brake�status�can�also�be�indi-
cated�once�the�system�has�woken�up.