The __ tells a driver how much pressure is in the air tanks.
Answers
Application pressure gauge
Air compressor governor
Supply pressure gauge
Drum brake
The Correct Answer and Explanation is :
The correct answer is Supply Pressure Gauge.
Explanation
The supply pressure gauge is a crucial component in vehicles equipped with air brakes. It provides a visual indication of the amount of air pressure available in the air brake system’s tanks. This is important because the proper functioning of air brakes relies on maintaining adequate air pressure within a specified range. If the pressure falls too low, the brakes might fail to operate effectively, posing a significant safety risk.
How It Works:
- Air Tank Monitoring: The air brake system uses compressed air stored in air tanks. The supply pressure gauge measures and displays the pressure in these tanks.
- Dual Gauges: Many modern vehicles have dual gauges to monitor multiple air tanks (primary and secondary systems). This redundancy ensures braking remains operational even if one system develops a problem.
- Driver Awareness: The supply pressure gauge helps the driver monitor the system’s air pressure during vehicle operation. If the pressure drops below a certain level (usually around 60 psi), a warning signal, such as a buzzer or light, is triggered.
Why It’s Essential:
- Safety Compliance: Drivers must check the supply pressure gauge as part of pre-trip inspections to ensure the system is functioning within the manufacturer’s specifications.
- Brake Performance: If the air pressure is too low, the brakes might not generate enough force to slow or stop the vehicle effectively.
- Preventing Emergency Locking: A loss of air pressure can cause spring brakes to activate, which could immobilize the vehicle unexpectedly.
In contrast, the application pressure gauge measures the air pressure being applied to the brakes when the brake pedal is pressed. The air compressor governor regulates when the air compressor turns on and off to maintain the system’s pressure. Drum brakes are a type of brake mechanism, not a gauge or pressure-related component.