TR801266 AD-IS Air Dryer Fit Freightliner Classic, Kenworth and Peterbilt

It removes moisture and contaminants from compressed air before it reaches the air tanks and valves. This helps reduce corrosion and prevents freeze-ups in cold weather, improving braking reliability. A properly functioning semi truck air dryer also helps protect downstream air system components.

This AD-IS air dryer is commonly used across multiple platforms, including Freightliner Classic, Kenworth, and Peterbilt applications when the ports and mounting match. For an air dryer for peterbilt 379 or an air dryer for peterbilt 379 fitment, confirm your existing unit’s part number and configuration align with bendix 801266 / TR801266 specifications. It can also serve as a freightliner air dryer or kenworth air dryer replacement when the application matches.

Many AD-9 air dryer and AD-IS style units allow service of wear items like the peterbilt air dryer purge valve and seals, depending on the exact configuration. If you notice frequent purging, air leaks, or moisture carryover, an air dryer purge valve replacement and an air dryer filter replacement can often restore normal operation. Always match the service kit to your specific truck air dryer model and ports to ensure proper sealing.