S2 - System Inspection

- Key OFF.

- Reconnect the vacuum line.

- Inspect power brake booster check valve, rubber grommet and all vacuum plumbing for cracks, holes, bad connections or missing clamps.

- Push down on brake pedal and hold.

- Key ON, engine running.

- Does the brake pedal move downward when the engine is started?

YES -- Vacuum system is OK.

NO -- Go to S3. S3 - Component Isolation Check