Air Brake Compressor and Governor Flashcards

What is the purpose of one-way check valves between air tanks?

Answer: To prevent pressure loss in one tank if another tank develops a leak

One-way check valves prevent air from flowing backward, protecting pressure in each tank if another develops a leak.

What is the role of the supply tank (wet tank) in the air brake system?

Answer: It receives air from the compressor first, allowing water and oil to separate out

The supply tank (wet tank) receives compressed air from the compressor first, where water and oil contaminants settle out before air flows to other tanks.

According to CDL requirements, how quickly should air pressure build from 85 to 100 psi at engine idle (600–900 RPM)?

Answer: Within 45 seconds

Air pressure should build from 85 to 100 psi within 45 seconds at 600–900 RPM to confirm the compressor is functioning properly.

What does the supply pressure gauge in the cab indicate?

Answer: The current air pressure available in the storage tanks

The supply pressure gauge shows the driver the current air pressure in the tanks so they know if adequate braking power is available.

What should you do if the air pressure gauge shows a continuous drop while the vehicle is parked with the engine off?

Answer: Investigate for air leaks before driving the vehicle

A continuous pressure drop while parked indicates a leak in the system that must be found and repaired before the vehicle is driven.

Why must the air compressor be properly lubricated at all times?

Answer: To prevent mechanical wear and seizure of compressor components

Proper lubrication prevents mechanical wear and overheating that could cause compressor components to seize and fail.