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301.03.0021 Air Dryer Valve, Brake System

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301.03.0021 Air Dryer Valve for DAF and Mercedes-Benz

301.03.0021

Summary

This air dryer valve is engineered for heavy commercial vehicle brake systems, specifically designed for DAF and Mercedes-Benz applications. It features a 24 V heater, M22x1.5 ports, and operates at 8.1 BAR to ensure reliable air processing and system protection. Equivalent to OE DAF 1285553, Knorr-Bremse II30179 and Mercedes-Benz 3714317015.

Product identifiers
EAN Code8699031079844
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Compatible OEM Codes

  • KNORR-BREMSE
    • LA 8225
    • LA 6252
    • K000478
    • II30448N50
    • II30179N49
    • II30179AT
    • II30179
  • MERCEDES BENZ
    • 371 431 70 15
  • DAF
    • 1285553

Description

What does an air dryer valve do?

This air dryer valve plays a critical role in the pneumatic brake system by managing moisture and contaminants. It is constructed from high-strength components to ensure durability under the demanding operating conditions of heavy commercial vehicles. By regulating air flow, it prevents water buildup within the braking lines.

Vehicle compatibility and specifications

This component is specifically fitted to DAF and Mercedes-Benz trucks. It maintains optimal pressure regulation at 8.1 BAR and is compatible with Knorr-Bremse systems. The unit features a 24 V heater to prevent freezing in cold climates and utilizes M22x1.5 and M12x1.5 port configurations to ensure a precise fit.

Installation and maintenance

For proper maintenance, technicians should inspect the valve during routine brake system service intervals. Checking the integrity of the M22x1.5 and M12x1.5 connections ensures no leaks are present in the pneumatic circuit. Regular inspection helps prevent moisture ingress that could lead to system corrosion.

System reliability

Consult your authorized distributor to ensure correct application for your specific vehicle model.

OE cross-reference

301.03.0021 (Air Dryer Valve Air Dryer Valves) is the equivalent of the DAF, Knorr-Bremse and Mercedes-Benz OE numbers. This part directly replaces DAF OE number 1285553. It also replaces Knorr-Bremse OE numbers II30179, II30179AT, II30179N49, II30448N50, K000478, LA6252, LA8225 and Mercedes-Benz OE number 3714317015.

Technical Specifications

Technical Specifications
Heater24 V
Port 1M22x1,5
Port 21M22x1,5
Pressure8,1 BAR
Port 22M12x1,5
Port 4/23M12x1,5

Other OEMs

DAF

  • 1285553

KNORR-BREMSE

  • LA8225
  • LA6252
  • LA 8225
  • LA 6252
  • K000478
  • II30448N50
  • II30179N49
  • II30179AT
  • II30179

MERCEDES BENZ

  • A3714317015
  • 3714317015
  • 371 431 70 15

Related Products

Repair Kits

Compatible Vehicles

Compatible Vehicles
BrandModelModel TypeEngine
DAF
KNORR-BREMSE
MERCEDES BENZ

FAQ

What is the function of the heater in this air dryer valve?
The 24 V heater prevents moisture from freezing within the valve, ensuring reliable operation in cold weather environments.
Which vehicle brands is this valve compatible with?
This part is designed for use in DAF and Mercedes-Benz heavy commercial vehicles and is compatible with Knorr-Bremse systems.
What are the key technical specifications of this component?
The valve operates at a pressure of 8.1 BAR, features a 24 V heater, and includes M22x1.5 and M12x1.5 port sizes.
How can I know if my air dryer valve needs replacement?
Technicians should look for signs of moisture in the air lines or pressure fluctuations that indicate the valve is no longer processing air correctly.
What are the OE reference numbers of this part?
301.03.0021 directly replaces DAF OE number 1285553. It also replaces Knorr-Bremse OE numbers II30179, II30179AT, II30179N49, II30448N50, K000478, LA6252, LA8225 and Mercedes-Benz OE number 3714317015.