Subaru 2003 Legacy Owner's Manual page 293

Starting and operating
To set the parking brake, press the brake pedal firmly and hold it down
while fully pulling up the parking brake lever.
HB4001BA
To release the parking brake, pull the lever up slightly, press the release
button, then lower the lever while keeping the button pressed.
When the parking brake is set while the engine is running, the parking
brake warning light comes on. After starting the vehicle, be sure that the
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warning light has gone out before the vehicle is driven. Refer to the
"Warning and indicator lights" section (chapter 3).
When parking your vehicle, always set the parking brake firmly and put
the shift lever in the "1" (1st) for an upgrade or "R" (Reverse) for a down-
grade for manual transmission vehicles, or in the "P" (Park) position for
automatic transmission vehicles. Always set the parking brake firmly
when parking your vehicle. Never rely on the transmission alone to hold
the vehicle.
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