When should a vehicle with a failed air brake circuit not be driven?

A vehicle with a failed air brake circuit should not be driven until repairs have been made because a malfunction in the air brake system can severely compromise the vehicle's ability to stop safely. The air brake system relies on air pressure to function effectively, and any failure within that system can lead to inadequate braking performance, which poses a significant risk to the driver, passengers, other road users, and the vehicle itself.

Driving a vehicle with a compromised air brake system not only violates safety regulations but can also lead to further damage to the braking system, escalation of repair issues, and may result in accidents due to loss of control. Therefore, ensuring that all necessary repairs are completed before operating the vehicle is crucial for maintaining proper function and safety.

While increasing air pressure, inspecting brakes, or refilling air tanks are important maintenance steps, none of these actions alone can substitute for the necessity of proper repairs to restore safe and compliant operation of the brake system.