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301.01.0029 Unloader Valve, Brake System
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301.01.0029 Unloader Valve for DAF and Mercedes-Benz

301.01.0029

Summary

This heavy-duty unloader valve is designed for air brake systems in Mercedes-Benz, DAF, and Peterbilt trucks. It features M22x1.5 and M12x1.5 ports and operates with a cut-out pressure of 7.3 BAR / 0.2 BAR to ensure precise pressure regulation. Equivalent to OE DAF 0871390, Liebherr 5026348 and Mercedes-Benz 0024317006.

Product identifiers
EAN Code8683457011144
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Compatible OEM Codes

  • WABCO
    • 975 303 449 0
    • 975 303 442 0
  • DAF
    • 1506502
    • 0871390
  • PETERBILT
    • S 9753034490
  • NEOPLAN
    • 110249400
  • MERCEDES BENZ
    • 002 431 70 06
  • LIEBHERR
    • 5026348

Description

What does an unloader valve do?

This unloader valve serves as a critical component within the pneumatic brake system, ensuring regulated air pressure distribution. Constructed from high-strength components, it manages air release to maintain optimal system stability during heavy-duty operation.

Compatible vehicles and systems

The component is compatible with various heavy commercial vehicles including DAF, Kenworth, Liebherr, Mercedes-Benz, Neoplan, and Peterbilt. It is also designed for use with WABCO systems to maintain consistent pneumatic performance across different vehicle architectures.

Installation and maintenance

Installation requires careful attention to the port specifications, specifically the M22x1.5 and M12x1.5 thread sizes. Technicians should verify that the cut-out pressure of 7.3 BAR / 0.2 BAR aligns with the specific vehicle requirements to ensure safe and efficient operation.

System performance

Regular inspection of the valve ports and inflation mechanisms is recommended to prevent air leaks or pressure irregularities in the braking circuit.

OE cross-reference

301.01.0029 (Unloader Valve) is the equivalent of the DAF, Liebherr, Mercedes-Benz, Neoplan, Peterbilt and WABCO OE numbers. This part directly replaces DAF OE numbers 0871390, 1506502. It also replaces Liebherr OE number 5026348, Mercedes-Benz OE number 0024317006, Neoplan OE number 110249400, Peterbilt OE number S9753034490 and WABCO OE numbers 9753034420, 9753034490.

Technical Specifications

Technical Specifications
Port 1M22x1,5
Port 4M12x1,5
Port 21M22x1,5
Port 22M12x1,5
Port 23M12x1,5
Cut-Out Pressure7,3 BAR / 0,2 BAR
Inflation ValveOK
Recycle Valve-

Other OEMs

DAF

  • 1506502
  • 0871390

KENWORTH

  • S 9753034490

LIEBHERR

  • 5026348

MERCEDES BENZ

  • A0024317006
  • 0024317006
  • 002 431 70 06

NEOPLAN

  • 110249400

PETERBILT

  • S 9753034490

WABCO

  • 9753034490
  • 9753034420
  • 975 303 449 0
  • 975 303 442 0

Related Products

Repair Kits

Compatible Vehicles

Compatible Vehicles
BrandModelModel TypeEngine
DAF
KENWORTH
LIEBHERR
MERCEDES BENZ
NEOPLAN
PETERBILT
WABCO

FAQ

What is the function of this unloader valve?
It acts as an air pressure relief valve within the pneumatic system to monitor and regulate air pressure levels effectively.
Which vehicle makes are compatible with this part?
This valve is suitable for heavy commercial vehicles such as DAF, Kenworth, Liebherr, Mercedes-Benz, Neoplan, and Peterbilt.
What are the technical port specifications?
The unit features specific port sizes including M22x1.5 for Port 1 and Port 21, and M12x1.5 for Port 4, Port 22, and Port 23.
How can I verify if this valve fits my truck?
Check the cut-out pressure requirements; this model operates at 7.3 BAR / 0.2 BAR to ensure correct system regulation.
What are the OE reference numbers of this part?
301.01.0029 directly replaces DAF OE numbers 0871390, 1506502. It also replaces Liebherr OE number 5026348, Mercedes-Benz OE number 0024317006, Neoplan OE number 110249400, Peterbilt OE number S9753034490 and WABCO OE numbers 9753034420, 9753034490.