BMW F12 2011 Technical Training Manual page 28

F12￿Chassis￿Dynamics
4.￿Brakes
Index
1
2
3
4
5
6
7
8
9
10
11
12
13
4.2.3.￿System￿structure
The￿EMF￿control￿unit￿receives￿the￿driver's￿command￿to￿engage￿the￿parking￿brake￿through￿the￿park-
ing￿brake￿button.￿The￿vehicle￿condition￿is￿queried/detected￿via￿the￿electrical￿system￿connection￿and
the￿bus￿systems.￿The￿control￿unit￿decides￿whether￿all￿conditions￿for￿engaging￿the￿parking￿brake￿are￿in
place.￿If￿this￿is￿the￿case,￿the￿two￿EMF￿actuators￿on￿the￿rear￿brake￿calipers￿are￿activated.
4.2.4.￿System￿function
Due￿to￿the￿spindle's￿self-locking￿facility,￿the￿clamping￿force￿remains￿securely￿applied￿even￿when￿no
power￿supply￿is￿connected,￿and￿the￿vehicle￿is￿thus￿securely￿held.￿Once￿the￿required￿force￿is￿reached,
the￿parking￿brake￿applied￿status￿is￿indicated￿by￿a￿red￿indicator￿lamp￿in￿the￿instrument￿panel￿(KOMBI)
and￿an￿additional￿red￿LED￿in￿the￿parking￿brake￿button.
24
Explanation
Dynamic￿Stability￿Control￿(DSC)
Central￿gateway￿module￿(ZGM)
Footwell￿module￿(FRM)
Car￿Access￿System￿(CAS)
Instrument￿panel￿(KOMBI)
Parking￿brake￿button
Junction￿box￿for￿the￿power￿distribution￿box
Luggage￿compartment￿power￿distribution￿box
EMF￿control￿unit
EMF￿actuator,￿rear￿left
EMF￿actuator,￿rear￿right
Wheel￿speed￿sensor,￿rear￿left
Wheel￿speed￿sensor,￿rear￿right