Cruise control set indicator light
Subaru Impreza / Subaru Impreza Owners Manual / Instruments and controls / Warning and indicator lights / Cruise control set indicator light

This light illuminates when vehicle speed has been set.
See also:
Brake booster
The brake booster uses engine manifold
vacuum to assist braking force. Do not
turn off the engine while driving because
that will turn off the brake booster, resulting
in poor braking power.
...
To increase the speed (by accelerator pedal)
1. Depress the accelerator pedal to accelerate the vehicle to the desired speed.
2. Press the “RES/SET” switch to the “SET” side once. Now the desired speed is
set and the vehicle will keep running ...
Breaking-in of new brake pads and linings
When replacing the brake pad or lining, use only genuine SUBARU parts. After
replacement, the new parts must be broken in as follows: ...
