Epb Electrical Operation And Control - Subaru Legacy 2015 Technicians Reference Booklet

2015 Legacy and Outback

EPB Electrical Operation and Control

The operation of the EPB at each rear brake caliper is accomplished using two wires that operate
the bidirectional movement of the EPB motors. There are no sensors incorporated into the caliper.
Sensing for apply and release is determined by the amount of amperage measured in the Hydraulic
Control Unit.
AUDIO
C15
C : 1 i 9 2
*
3
C15
C: i87
i163
EPB CONTROL SWITCH
EPB ON
LOCK
BRAKE FLUID
LEVEL SWITCH
1 BR/Y
2
B16
REF. TO GND [k]
During apply control, the polarity of the wires is controlled to turn the ball nut counter clockwise.
This will screw the ball nut into the piston and place mechanical force on the inner brake pad
and pull the caliper inward to force the outer brake pad into the rotor. An initial current spike will
occur as the motor first starts to turn and then level off as the motor turns without opposing any
mechanical force. As the Hydraulic piston makes contact with the inner brake pad, current starts
to increase and continues to increase as the brake caliper is pulled inward. The amperage will
reach maximum level after both brake pads are contacting the rotor with a predetermined amount
of mechanical force.
FB-71
F/B FUSE NO. 14
(B)
W/G
W/G
7 GR
12 W/G
2 B
1 Y
6 P
RELEASE
5 LG
i112
B60
J/C
B479
GV
EPB Wiring Schematic
New Technology Training
FB-45 MB-8
F/B FUSE NO. 3 SBF-15 M/B FUSE NO. 33
(IG) (B)
*
2
B310 VDC CM
132
MB-7 FB-52
F/B FUSE NO. 10
(B) (IG)
HILL HOLD
SWITCH
P 1
G 4
i156
REAR BRAKE
CALIPER LH
R 2
R154
W 1
REAR BRAKE
CALIPER RH
R 2
R153
W 1
R149 R140
R35 R36
R40
i128
i112
B60
(Module 926)
8-21
June 2014