See also:

Checking the brake pedal free play
1) 0.08 – 0.18 in (2 – 5 mm) Stop the engine and firmly depress the brake pedal several times. Lightly pull the brake pedal up with one finger to check the free play with a force of less than 2 ...

SAFETY
Although the STi wasn't designed as a family car, all of the family-centric safety features on the Impreza sedan are in it. The STi has four-wheel-disc antilock brakes with brake assist, stability ...

ABS system self-check
Just after the vehicle is started, you may feel on the brake pedal a vibration similar to when the ABS operates, and you may also hear the sound of the ABS working from the engine compartment. ...