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303.01.0025.01 Relay Valve Repair Kit, Brake System
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303.01.0025.01 Compatible Relay Valve Repair Kit

303.01.0025.01

Summary

This relay valve repair kit is designed to overhaul air brake relay valves, ensuring fast and balanced air delivery to brake chambers. It is compatible with WABCO systems used in DAF, Iveco, Liebherr, MAN, and Mercedes-Benz vehicles. Equivalent to OE DAF 689541, Iveco 8124656 and Liebherr 502991108.

Product identifiers
EAN Code8683457003941
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Compatible OEM Codes

  • WABCO
    • 973 001 002 2
  • MERCEDES BENZ
    • 000 430 54 60
  • MAN
    • 81.52116-6040
  • LIEBHERR
    • 502991108
  • IVECO
    • 8124656
  • DAF
    • 689541

Description

What does a relay valve repair kit do?

This repair kit is essential for maintaining the pneumatic braking system of heavy commercial vehicles. It provides the necessary components to overhaul relay valves that manage air pressure distribution to the rear axle brake chambers. By renewing the internal components, this kit helps ensure rapid and balanced air delivery, which is critical for shortening brake response times.

Vehicle and system compatibility

This kit is compatible with WABCO systems found on DAF, Iveco, Liebherr, MAN, and Mercedes-Benz vehicles. Using high-strength components helps restore optimal performance to the pneumatic circuit without requiring a complete valve replacement.

Maintenance and installation guidance

For technicians performing maintenance, this kit addresses common issues like air leaks or delayed braking response caused by worn seals. It is recommended to inspect the valve body and ensure all internal surfaces are clean during the overhaul process to maintain system integrity.

Troubleshooting brake response issues

Regular inspection of the relay valve assembly can prevent sudden brake lag. When replacing internal elements, verify that the new components match the original specifications of the installed pneumatic system.

OE cross-reference

303.01.0025.01 (Relay Valve Repair Kit Relay Valves) is the equivalent of the DAF, Iveco, Liebherr, MAN, Mercedes-Benz and WABCO OE numbers. This part directly replaces DAF OE number 689541. It also replaces Iveco OE number 8124656, Liebherr OE number 502991108, MAN OE number 81521166040, Mercedes-Benz OE number 0004305460 and WABCO OE number 9730010022.

Other OEMs

DAF

  • 689541

IVECO

  • 8124656

LIEBHERR

  • 502991108

MAN

  • 81521166040
  • 81.52116-6040

MERCEDES BENZ

  • A0004305460
  • 0004305460
  • 000 430 54 60

WABCO

  • 9730010022
  • 973.001.002.2
  • 973 001 002 2

Compatible Vehicles

Compatible Vehicles
BrandModelModel TypeEngine
DAF
IVECO
LIEBHERR
MAN
MERCEDES BENZ
WABCO

FAQ

What is the function of a relay valve repair kit?
The kit contains the necessary components to overhaul a relay valve, restoring its ability to redirect reservoir air to the brake chambers quickly and efficiently.
Which vehicle brands are compatible with this kit?
This kit is designed for WABCO systems used in DAF, Iveco, Liebherr, MAN, and Mercedes-Benz heavy commercial vehicles.
What symptoms indicate a need for a repair kit?
Common signs include air leaks within the pneumatic system or a noticeable delay in braking response time during operation.
How can I ensure I am selecting the correct kit?
It is essential to verify that the replacement components match the technical specifications of the existing valve installed on the vehicle.
What are the OE reference numbers of this part?
303.01.0025.01 directly replaces DAF OE number 689541. It also replaces Iveco OE number 8124656, Liebherr OE number 502991108, MAN OE number 81521166040, Mercedes-Benz OE number 0004305460 and WABCO OE number 9730010022.