Emergency Brake Operation; Emergency Release Of The Epb - Subaru Legacy 2015 Technicians Reference Booklet

2015 Legacy and Outback

Emergency Brake Operation

The EPB also provides for an Emergency Brake function that can be activated while the vehicle
is in motion. Pulling up on the EPB control lever and holding the lever upward will activate the
Emergency Brake. The 2015 Legacy and Outback Emergency Brake will first attempt to slow down
through the use of the normal hydraulic components. The Motor Relay and Valve Relay in the HCU
will activate, supplying hydraulic pressure to all brake calipers (Front and Rear). Once maximum
braking is occurring (just before wheel lock up), the pump will turn off and hold mode of ABS will
maintain the current braking pressure. The EPB motor will activate only after the vehicle speed
drops below a set value.
If hydraulic pressure cannot be established, the EPB motor will activate immediately. The rear
wheels will lock up and unlock while the EPB switch is held in the on position. The EPB control
unit (HCU) will control the application and release of the EPB based on wheel speed sensor input
and always pulse the two sides together.

Emergency Release of the EPB

If the parking brake cannot be released with the EPB switch (example motor sticking), it is necessary
to remove the parking brake motor and actuator from the caliper body.
How to release
1. Lift the vehicle with a jack and remove the tire.
2. Remove the EPB connector from the motor.
3. Remove the motor attachment bolts (2 x 5 mm hexagon bolt), turn the piston shaft clockwise
to loosen the ball screw and confirm the release of the EPB.
4. Install the motor.
5. Install the tire and put the vehicle on the ground.
6. Release the EPB on the opposite side in the same way.
New Technology Training
Emergency Brake ON
137
(Module 926)
8-25
June 2014