Please read- if you are stranded or stuck with a dead battery or for some reason the brake won't release, it is best to contact your local dealer or an emergency towing service. Information here is for emergencies only and should not be used unless you are a trained technician with proper safety equipment.
Subaru roadside emergency service phone number under the 3yr/36000 warranty is 800-261-2155

This website is not responsible for any result of removing or releasing the brakes or any components.

note: this unofficial independent Subaru research site by Joe Spitz is designed to help you learn about Subarus. It is not sponsored, authorized,  supported or
approved by Subaru or any dealer and is not connected to or affiliated with, any dealer. Always contact your local dealer. Information subject to change, correction, updating.

Make sure the tranmission is in Park (automatic), or 1st gear or reverse gear (manual), and the tires are securely blocked so the vehicle cannot roll

Insert the electronic parking brake release tool into the cap of the parking brake release device.
Remove the cap of the parking brake release device by turning the electronic parking brake release tool counterclockwise.
Note  you should call roadside assistance and get the battery jumped or get the car towed instead.

Break the white plastic film and insert the electronic parking brake release tool into the parking brake release device.
Turn the electronic parking brake release tool clockwise approximately 200-250 rotations.
Note: after breaking the plastic film it is recommended that the unit be replaced to minimize possible future safety issues from moisture and dirt contamination

Then to confirm that the electronic parking brake is released, carefully move the automatic transmission shift lever to “N”, or step on the clutch (manual), slightly move the tire stops and have someone push the vehicle slightly while you remain in the driver’s seat. If the vehicle moves, the electronic parking brake has been released.
Readjust the tire stops so the car cannot move.
Reinstall the cap to the parking brake release device.
 

electronic parking brake release tool is a metal rod in a slot in the cargo storage bin	the brake release tool handle is the screwdriver handle in the spare tire toolkit
the screw driver comes apart.	Insert the brake release rod into the handle
look for the parking brake release device under the car in front of right rear wheel	look under the car by rear passenger door for the parking brake release device. What you see is the cap which has to be removed.
another view of the brake release cap, looking up under the car by the rear passenger door.	close-up of the brake release device cap. 1st step is to remove the cap
Insert the electronic parking brake release tool into the parking brake release cap and remove it by turning counter-clockwise. Note: it is recommended that you do NOT do this. You should call roadside assistance and get the battery jumped, or get the car towed instead.	if you are stranded or stuck with a dead battery or for some reason the brake won't release, it is best to contact your local dealer for roadside assistance or an emergency towing service.  Note: following these instructions and breaking the white film could require replacing the brake release device  to minimize possible moisture and dirt contamination.  This will be expensive.  Call roadside assisatance for a battery jump instead- its easier and will cost less. With the cap now off,  break the white film and insert the electronic parking brake release tool into the parking brake release device and turn it clockwise app 200-250 rotations. warning: do not turn the electronic parking brake release tool counterclockwise or turn it around more than 300 times. Doing so may result in a malfunction of the electronic parking brake.  Do not use electric power tools to turn the electronic parking brake release tool. Doing so may result in a malfunction of the electronic parking brake.