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303.02.0108 4-circuit protection valve, Brake System

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303.02.0108 4-Circuit Protective Valve compatible with DAF

303.02.0108

Summary

Heavy-duty 4-circuit protection valve designed for pneumatic brake systems in DAF and Scania heavy commercial vehicles. Features M22x1.5 Port 1 and M16x1.5 ports (21, 22, 23, 24) with specific opening pressures of 7.5 BAR and 8.5 BAR to ensure optimal air distribution. Equivalent to OE DAF 1525882, Scania 1444899 and WABCO 9347147320.

Product identifiers
EAN Code8683457009790
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Compatible OEM Codes

  • WABCO
    • 934 714 732 0
  • SCANIA
    • 1444899
  • DAF
    • 1525882

Description

What does a 4-circuit protection valve do?

This 4-circuit protection valve serves as a critical component within the pneumatic brake system of heavy commercial vehicles. It functions by receiving pressurized air from the compressor and distributing it across four independent circuits, including front and rear brakes and auxiliary lines. The valve is engineered with high-strength components to withstand constant pressure fluctuations in demanding service environments.

Vehicle and system compatibility

This component is specifically compatible with DAF and Scania vehicles, ensuring reliable pressure distribution for heavy duty applications. It is also fitted to other heavy commercial vehicle brands that utilize similar pneumatic architectures. This part works seamlessly within WABCO systems to maintain overall braking stability.

Installation and technical specifications

Installation requires precise attention to the port specifications: Port 1 features an M22x1.5 thread, while Ports 21 through 24 utilize M16x1.5 threads. Technicians should verify that the opening pressures (7.5 BAR for most ports and 8.5 BAR for port 23) align with the vehicle's specific pneumatic requirements to prevent pressure loss in the primary braking circuits.

Maintenance guidance

Regular inspection of the valve housing and connection threads is recommended during routine maintenance to prevent leaks. Ensuring the integrity of these ports is vital for maintaining the safety of the entire air brake system in heavy commercial fleets.

OE cross-reference

303.02.0108 (4-circuit protection valve) is the equivalent of the DAF, Scania and WABCO OE numbers. This part directly replaces DAF OE number 1525882. It also replaces Scania OE number 1444899 and WABCO OE number 9347147320.

Technical Specifications

Technical Specifications
Port 1M22x1,5
Port 21M16x1,5
Port 22M16x1,5
Port 23M16x1,5
Port 24M16x1,5
Opening Pressure 217,5 BAR
Opening Pressure 227,5 BAR
Closing Pressure 215,5 BAR
Closing Pressure 225,5 BAR
Closing Pressure 235,5 BAR
Closing Pressure 245,5 BAR
Opening Pressure 238,5 BAR
Opening Pressure 247,5 BAR

Other OEMs

DAF

  • 1525882

SCANIA

  • 1444899

WABCO

  • 9347147320
  • 934 714 732 0

Related Products

Repair Kits

Compatible Vehicles

Compatible Vehicles
BrandModelModel TypeEngine
DAF
SCANIA
WABCO

FAQ

What is the function of this 4-circuit protection valve?
It distributes pressurized air from the compressor to four separate circuits while isolating any circuit experiencing a pressure loss to protect the rest of the system.
Which vehicle brands is this component compatible with?
This valve is designed for use in DAF and Scania heavy commercial vehicles and is compatible with WABCO systems.
What are the thread sizes for the ports?
The unit features one M22x1.5 port (Port 1) and four M16x1.5 ports (Ports 21, 22, 23, and 24).
What are the operating pressure thresholds?
The valve operates with opening pressures typically at 7.5 BAR, with Port 23 reaching 8.5 BAR, and closing pressures set at approximately 5.5 BAR.
What are the OE reference numbers of this part?
303.02.0108 directly replaces DAF OE number 1525882. It also replaces Scania OE number 1444899 and WABCO OE number 9347147320.