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303.05.0021 Trailer Control Valve, Brake System
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303.05.0021 Iveco & Mercedes-Benz Compatible Trailer Control Valve

303.05.0021

Summary

This high-strength trailer control valve is designed for heavy commercial vehicle air brake systems. It features multiple M16x1.5 ports to ensure precise pneumatic control and reliable performance in demanding environments. Compatible with Mercedes-Benz and Iveco systems. Equivalent to OE Iveco 4781489, Mercedes-Benz 0024311705 and WABCO 9730025230.

Product identifiers
EAN Code8683457009929
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Compatible OEM Codes

  • IVECO
    • 4792629
    • 4781489
  • WABCO
    • 973 002 523 0
  • MERCEDES BENZ
    • 002 431 17 05

Description

What does a trailer control valve do?

This trailer control valve plays a critical role in the air brake system of heavy commercial vehicles, specifically managing the pneumatic pressure delivered to the trailer. By balancing air pressure based on driver input and providing quick-release exhaust, it ensures stable braking performance during transit.

Vehicle and system compatibility

This component is compatible with Mercedes-Benz and Iveco trucks and tractor units. It is designed to function effectively within pneumatic brake lines, maintaining consistent pressure levels to support the vehicle's safety systems during operation.

Installation and maintenance

Installation requires careful attention to the M16x1.5 port connections to ensure a leak-free seal. Technicians should verify that all pneumatic lines are properly aligned with the ports before securing the unit. Regular inspection of seals and connections is recommended to maintain optimal braking response.

Troubleshooting braking issues

If you notice uneven braking or air leaks in the tractor-trailer line, this component may require inspection or replacement. Consult your authorized distributor.

OE cross-reference

303.05.0021 (Trailer Control Valve) is the equivalent of the Iveco, Mercedes-Benz and WABCO OE numbers. This part directly replaces Iveco OE numbers 4781489, 4792629. It also replaces Mercedes-Benz OE number 0024311705 and WABCO OE number 9730025230.

Technical Specifications

Technical Specifications
Port 12M16x1,5
Port 22M16x1,5
Port 11M16x1,5
Port 41M16x1,5
Port 42M16x1,5
Port 43M16x1,5

Other OEMs

IVECO

  • 4792629
  • 4781489

MERCEDES BENZ

  • A0024311705
  • 002 431 17 05

WABCO

  • 9730025230
  • 973 002 523 0

Related Products

Repair Kits

Compatible Vehicles

Compatible Vehicles
BrandModelModel TypeEngine
IVECO
MERCEDES BENZ
WABCO

FAQ

What is the function of this trailer control valve?
The valve balances air pressure delivered to the trailer based on input, ensuring stable braking and providing quick exhaust for rapid pressure release.
Which vehicle brands is this component compatible with?
This part is compatible with Mercedes-Benz and Iveco heavy commercial vehicles, including trucks and tractor units.
What are the technical connection specifications?
The valve features multiple M16x1.5 ports (including ports 12, 22, 11, 41, 42, and 43) for pneumatic connections.
How can I identify if the valve needs replacement?
Technicians should look for signs of air leaks in the tractor-trailer line or inconsistent braking pressure during vehicle testing.
What are the OE reference numbers of this part?
303.05.0021 directly replaces Iveco OE numbers 4781489, 4792629. It also replaces Mercedes-Benz OE number 0024311705 and WABCO OE number 9730025230.