Is it permitted to drive a heavy vehicle when the air pressure in the braking system is below the required minimum?
- Yes, but only under permission of a policeman or an officer.
- Yes, but only if the vehicle properly brakes.
- Yes, if definitely no leak is detected.
- Correct answer: No.
Why this is the answer
The correct answer in the official bank: No.
In a heavy vehicle with air-operated brakes, the braking force depends on the air pressure in the system. When the pressure is below the required minimum, braking may weaken or fail, so it is forbidden to drive until the pressure reaches the required level. Braking that seems good at a given moment, or the absence of a visible leak, does not guarantee safe braking.