Which part of the Pennsylvania commercial skills examination comes first, and what air-brake issue can automatically fail that portion when applicable?

1. The safety inspection comes first, and inability to correctly perform the air brake check can automatically fail it
2. The road test comes first, and forgetting a turn signal automatically passes the air brake check
3. Basic maneuvers come first, and air brakes are never checked
4. Student discharge comes first, and air brake checks are optional