AIR TANKS

Air Tanks For Peterbilt Trucks

Air tanks store the compressed air that powers your Peterbilt's braking system, suspension, and accessories. Most trucks run multiple tanks — a wet tank that receives air directly from the compressor and dry tanks that supply clean air to individual circuits. Corrosion, physical damage, and failed drain valves can all compromise tank integrity and reduce the air volume available to critical systems. We carry replacement air tanks and tank accessories for Peterbilt trucks.

Frequently asked questions about air tanks

How many air tanks does a typical Peterbilt have?

Most Peterbilt Class 8 trucks have three to five air tanks, depending on the configuration. This typically includes one wet tank (also called a supply tank) that collects air and moisture directly from the compressor, and two or more dry tanks that feed individual air circuits for the primary brakes, secondary brakes, and accessories.

Why is it important to drain the wet tank daily?

The wet tank collects the majority of moisture and contaminants that the air dryer doesn't catch. If this moisture isn't drained, it can carry over into the dry tanks and downstream components, causing corrosion inside the tanks, freezing in cold weather, and premature failure of brake valves and air dryer cartridges.

How do I know if an air tank needs to be replaced?

Inspect tanks for external rust, dents, or cracks, especially around the weld seams and mounting brackets. Internal corrosion is harder to spot but can be identified by draining the tanks and checking for rusty water or flaky debris. If a tank fails a pressure test or has significant external damage, it should be replaced rather than repaired.

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