Manitoba Airbrake Practice Exam

How can a malfunctioning air brake system be indicated during a test?

1. By consistent air pressure readings

2. By unresponsive brakes or fluctuating air pressure

3. By a smooth drive

4. By rapid air pressure build-up

The correct answer is: By unresponsive brakes or fluctuating air pressure

A malfunctioning air brake system can often be indicated by signs such as unresponsive brakes or fluctuating air pressure. This situation suggests that there may be a leak in the system, a failed component, or an issue with the air compressor, all of which can prevent the brakes from engaging as they should. Unresponsive brakes indicate that the driver cannot control the vehicle effectively, which poses a serious safety risk. Additionally, fluctuating air pressure can be a sign of inconsistent air supply or inefficiencies within the braking system that may lead to brake failure. Consistent air pressure readings would typically indicate a properly functioning system, while a smooth drive does not provide any indication of potential braking issues. Rapid air pressure build-up could suggest that the system is functioning well, as it's often desired to have efficient pressure accumulation to operate the brakes effectively. Thus, the presence of either unresponsive brakes or irregular air pressure is a clear indicator that there is a problem requiring immediate attention.