What is the standard pre-trip inspection procedure for a taxi's braking and steering systems before leaving the parking depot?

1. Only check if the horn sounds loudly
2. Inspect brake fluid level, test brake pedal firmness and free travel, check steering wheel free play, and test braking deceleration smoothly at low speed
3. Assume braking is fine if the handbrake lever moves freely
4. Accelerate to 100 km/h immediately to test emergency braking on city streets