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301.01.0021 Unloader Valve, Brake System
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301.01.0021 Unloader Valve for Scania and DAF

301.01.0021

Summary

This unloader valve features M22x1,5 port configurations and a 9,5 BAR cut-out pressure. Designed for heavy commercial vehicle air systems, it is compatible with Scania, DAF, Iveco, and Renault Trucks. Equivalent to OE DAF 1505480, Iveco 02517678 and Renault Trucks 5000809518.

Product identifiers
EAN Code8683457011069
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Compatible OEM Codes

  • IVECO
    • 02521210
    • 02517784
    • 02517678
  • WABCO
    • 975 303 480 0
  • SCANIA
    • 1935692
  • RENAULT TRUCKS
    • 5000809518
  • DAF
    • 1505480

Description

What does an unloader valve do?

This unloader valve plays a critical role in the pneumatic brake system by regulating air pressure within the circuit. It ensures the system operates within safe parameters by managing the air release at a specific threshold, utilizing high-strength components to maintain reliability under heavy-duty service conditions.

Vehicle and engine compatibility

The component is specifically designed for heavy commercial vehicles including Scania, DAF, Iveco, and Renault Trucks. It is also compatible with WABCO systems to ensure seamless integration into existing air brake architectures.

Installation and maintenance

Technicians should note the M22x1,5 port sizes and the 9,5 BAR / 0,2 BAR cut-out pressure settings during installation. Regular inspection of the ports and the inflation valve is recommended to ensure optimal pneumatic performance and prevent system pressure drops.

Troubleshooting guidance

When replacing this unit, verify that all connections are secure and that the recycle valve functions correctly to maintain system integrity.

OE cross-reference

301.01.0021 (Unloader Valve) is the equivalent of the DAF, Iveco, Renault Trucks, Scania and WABCO OE numbers. This part directly replaces DAF OE number 1505480. It also replaces Iveco OE numbers 02517678, 02517784, 02521210, Renault Trucks OE number 5000809518, Scania OE number 1935692 and WABCO OE number 9753034800.

Technical Specifications

Technical Specifications
Port 1M22x1,5
Port 4-
Port 21M22x1,5
Port 23-
PluggedOK
Cut-Out Pressure9,5 BAR / 0,2 BAR
Inflation ValveOK
Recycle ValveOK
Port 22FITTING/KÖR TAPA

Other OEMs

DAF

  • 1505480

IVECO

  • 02521210
  • 02517784
  • 02517678

RENAULT TRUCKS

  • 5000809518

SCANIA

  • 1935692

WABCO

  • 9753034800
  • 975 303 480 0

Related Products

Repair Kits

Compatible Vehicles

Compatible Vehicles
BrandModelModel TypeEngine
DAF
IVECO
RENAULT TRUCKS
SCANIA
WABCO

FAQ

What is the function of this unloader valve?
It regulates air pressure within the brake system by releasing air at a set cut-out pressure of 9,5 BAR to prevent over-pressurization.
Which vehicle brands is this component compatible with?
This part is designed for Scania, DAF, Iveco, and Renault Trucks, and is also compatible with WABCO systems.
What are the technical port specifications?
The unit features M22x1,5 ports (Port 1 and Port 21) to ensure correct fitment in heavy commercial vehicle pneumatic circuits.
How can I identify if my unloader valve needs replacement?
Technicians should look for symptoms like inconsistent air pressure or failure to reach the 9,5 BAR threshold during system testing.
What are the OE reference numbers of this part?
301.01.0021 directly replaces DAF OE number 1505480. It also replaces Iveco OE numbers 02517678, 02517784, 02521210, Renault Trucks OE number 5000809518, Scania OE number 1935692 and WABCO OE number 9753034800.