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301.01.0030 Unloader Valve, Brake System
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301.01.0030 Mercedes-Benz Unloader Valve Equivalent

301.01.0030

Summary

This unloader valve is engineered for heavy commercial vehicle brake systems. Featuring M22x1.5 and M12x1.5 port configurations and an 8.5 BAR cut-out pressure, it ensures reliable air pressure regulation for Mercedes-Benz, Alexander Dennis, and Liebherr vehicles. Equivalent to OE Alexander Dennis AB9753034720, Liebherr 502657908 and Mercedes-Benz 0020317106.

Product identifiers
EAN Code8683457011151
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Compatible OEM Codes

  • MERCEDES BENZ
    • 002 431 89 06
    • 002 431 71 06
    • 002 031 71 06
  • WABCO
    • 975 303 472 0
  • LIEBHERR
    • 502657908
  • ALEXANDER DENNIS
    • AB9753034720

Description

What does an unloader valve do?

This unloader valve serves a critical role in the pneumatic brake system by regulating air pressure levels through precise relief mechanisms. It ensures that the system maintains stable pressure within the specified operating parameters, preventing over-pressurization during heavy-duty service cycles.

Vehicle and system compatibility

Designed for compatibility with Mercedes-Benz, Alexander Dennis, and Liebherr vehicles, this component is essential for maintaining air brake integrity. It is also compatible with WABCO systems, providing a reliable replacement for original equipment components in heavy commercial vehicle applications.

Technical specifications and installation

The unit features specific port dimensions including M22x1.5 and M12x1.5 to ensure correct fitment within the pneumatic circuit. Technicians should verify the cut-out pressure of 8.5 BAR and the inflation valve status during installation to ensure optimal system performance.

Maintenance guidance

Regular inspection of the unloader valve can prevent air leaks and ensure consistent braking performance across the vehicle's pneumatic system.

OE cross-reference

301.01.0030 (Unloader Valve) is the equivalent of the Alexander Dennis, Liebherr, Mercedes-Benz and WABCO OE numbers. This part directly replaces Alexander Dennis OE number AB9753034720. It also replaces Liebherr OE number 502657908, Mercedes-Benz OE numbers 0020317106, 0024317106, 0024318906 and WABCO OE number 9753034720.

Technical Specifications

Technical Specifications
Port 1M22x1,5
Port 4M12x1,5
Port 21M22x1,5
Port 22M12x1,5
Port 23M12x1,5
Cut-Out Pressure8,5 BAR / 0,2 BAR
Inflation ValveOK
Recycle Valve-

Other OEMs

ALEXANDER DENNIS

  • AB9753034720

LIEBHERR

  • 502657908

MERCEDES BENZ

  • A0024318906
  • A0024317106
  • A0020317106
  • 0024318906
  • 0024317106
  • 0020317106
  • 002 431 89 06
  • 002 431 71 06
  • 002 031 71 06

WABCO

  • 9753034720
  • 975 303 472 0

Related Products

Repair Kits

Compatible Vehicles

Compatible Vehicles
BrandModelModel TypeEngine
ALEXANDER DENNIS
LIEBHERR
MERCEDES BENZ
WABCO

FAQ

What is the function of this unloader valve?
It regulates air pressure within the brake system by releasing air at a specific cut-out pressure to maintain stable operation.
Which vehicles is this part compatible with?
This component is designed for use in Mercedes-Benz, Alexander Dennis, and Liebherr heavy commercial vehicles.
What are the port specifications for this unit?
The unit features M22x1.5 ports (Port 1 and 21) and M12x1.5 ports (Port 4, 22, and 23) for precise pneumatic connection.
What is the cut-out pressure rating?
The specified cut-out pressure for this unloader valve is 8.5 BAR / 0.2 BAR.
What are the OE reference numbers of this part?
301.01.0030 directly replaces Alexander Dennis OE number AB9753034720. It also replaces Liebherr OE number 502657908, Mercedes-Benz OE numbers 0020317106, 0024317106, 0024318906 and WABCO OE number 9753034720.