Is it permitted to drive a heavy vehicle when the air pressure in the braking system is below the required minimum?

1. Yes, but only under permission of a policeman or an officer.
2. Yes, but only if the vehicle properly brakes.
3. Yes, if definitely no leak is detected.
4. Correct answer: No.

WhyIf the air pressure in the brake system is below the minimum, a heavy vehicle may not be driven. The brakes may fail.