The air brake system contains some key components - air dryer, air compressor, air governor, air tanks, airlines and air fittings. You can help keep the air brake system in peak condition by understanding how the system operates and attending to certain maintenance items.

The air governor is usually mounted near to the air compressor. Specific guidelines must be in place for the air governor to properly operate the air compressor. Although there is an adjustment dial on the air governor, settings should only be performed by a representative of the chassis manufacturer with knowledge of the proper parameters.

The air governor monitors air pressure in the supply reservoir and operates the compressor to control air system pressure. The air governor is responsible for maintaining air system pressure between approximately 100 to 120 psi. On later model motor homes the air system pressure range generally falls between 110-130 psi. Reference your chassis operator's manual for specific rankings.

Close tolerance pistons inside the air governor deliver measured amounts of air to the system. Dirt and debris, water due to condensation and oil from the compressor can all prevent the air governor from properly functioning.

Keep the tank free of debris by regularly opening the air tank drain valves located on the tank, or at the remote air tank drains in the front and the rear. The air governor has a filter located on the exhaust side and this should be changed once per year.

If the air system takes longer than five minutes to build this may indicate an air leak caused by loose fittings, a faulty air dryer, worn seals or hoses. Contaminants plugging the system can also slow down building air pressure. Also check to be sure there is no blockage at the exhaust port or the governor that might be slowing down compressor response time.

It may be necessary to pinpoint air loss problems by applying a leak detection solution to fittings. You can purchase this solution at most auto supply outlets. Before you begin, make sure to have the frame adequately supported by jack stands and that the wheels are chocked fore and aft to prevent movement. Spray the fittings. If bubbles appear, air is escaping from the air system.