301.03.0070.04 Repair Kit for Air Processing Units

What does an air processing unit repair kit do?

An air processing unit repair kit is a service set designed for the in-place overhaul of the unit that, in a heavy commercial vehicle's air brake system, dries the compressed air delivered by the compressor, limits its pressure and distributes it to the front brake, rear brake, parking and trailer circuits.

Vehicle compatibility and application

This component is essential for maintaining the integrity of the pneumatic system. It is fitted to Iveco and DAF trucks, ensuring that air pressure remains stable throughout the braking and suspension circuits. By using high-strength components, this kit helps prevent leaks and ensures consistent air delivery across all critical pneumatic lines.

Installation and maintenance guidance

For optimal performance, technicians should ensure surface cleanliness and use correct lubricants during installation. When performing an overhaul, it is vital to verify that all sealing elements and spring assemblies are correctly seated to prevent pressure loss between circuits. Always consult the vehicle manufacturer's service manual for specific torque requirements.

Troubleshooting and selection

Regular maintenance of these units helps avoid sudden pressure drops in the braking system. Choosing a high-quality service set allows for an economical renewal of heavily loaded components without the need for a full unit replacement.

OE cross-reference

301.03.0070.04 (Air Processing Unit Repair Kit) is the equivalent of the Knorr-Bremse OE number. This part directly replaces Knorr-Bremse OE number K066243K50.