Subaru Legacy 2015 Technicians Reference Booklet page 133

2015 Legacy and Outback
Time is measured during the application of the EPB until a pre-established amperage level is
reached. This represents the normal EPB on state. This value is also used to determine how long
to operate the motor in the reverse direction when the EPB is turned off. As the brake pads wear,
the ball nut parks at a lower position on the worm gear. The EPB release motor operation time,
determines the final position.
Note: The amount of time and amperage needed to release the EPB is always lower
than the application time and amperage due to the reduced work load.
During EPB release, the polarity of the wires to the EPB motor is reversed and the ball nut rotates
clockwise to release the mechanical tension on the inner brake pad and caliper.
New Technology Training
EPB ON
EPB OFF
133
(Module 926)
8-22
8-23
June 2014