What is the normal pressure in a vehicle’s pneumatic (compressed air) braking system?
- The maximum pressure the vehicle can generate.
- Correct answer: As determined by the vehicle’s manufacturer.
- The pressure in which the vehicle brakes efficiently.
- As determined by local laws.
Why this is the answer
The correct answer in the official bank: As determined by the vehicle’s manufacturer.
Each manufacturer designs its vehicle's air brake system for a specific working pressure, so the normal pressure is the one the manufacturer sets. Check the pressure gauge to make sure this value is reached before moving off, and keep watching it while driving. The maximum pressure the compressor can produce is not the normal pressure, and the law does not set one figure for all vehicles.