Operating Check

WARNING: This page is about a different car, the 2005 Nissan Altima. However, it is still accessible from the selected car via links, so may be relevant.

Stop engine and depress brake pedal several times. Check that pedal stroke does not change.
Depress brake pedal, then start engine. If pedal goes down slightly, operation is normal.
CAUTION: Depress brake pedal in 5 second intervals.

Fig 1: Checking Brake Booster Operation
Courtesy of NISSAN MOTOR CO., U.S.A.