301.12.0004 Silencer for Air Processing Units

What is an air processing unit silencer?

An air processing unit silencer is a component fitted to the air dryer of heavy commercial vehicles that quiets the pressurized air vented during regeneration and blocks dirt and moisture from entering from outside.

Compatible vehicles and engines

This component is essential for the pneumatic brake system of heavy vehicles, including Volvo models like the FH16, FM13, and VNL, as well as Kenworth T800 and W900 units. It is also fitted to Peterbilt 379/378, Western Star 4900, Mack Pinnacle/Granite, and Renault Trucks Kerax/Premium models. These parts are compatible with WABCO systems and are engineered to handle high-flow discharge during purge cycles.

Installation and maintenance

To ensure proper system integrity, technicians should inspect the silencer for clogging or excessive noise during the regeneration phase. Maintaining this small component helps prevent moisture and environmental contaminants from entering the pneumatic circuit. When replacing, ensure compatibility with the specific air processing unit model used in the vehicle.

System performance

Proper selection ensures that the high-pressure air bursts during cleaning cycles are muffled effectively, protecting the surrounding components from debris and excessive vibration.

OE cross-reference

301.12.0004 (Air Processing Unit Silencer) is the equivalent of the DAF, Lohr, Mercedes-Benz, Otokar, Renault Trucks, Scania, VDL and WABCO OE numbers. This part directly replaces DAF OE numbers 1343945, 1506168. It also replaces Lohr OE number A05101306, Mercedes-Benz OE number 0004303870, Otokar OE number 13C2508416AA, Renault Trucks OE number 5001020320, Scania OE number 1932666, VDL OE number 30022292 and WABCO OE number 4324070500.