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Four-Circuit Protection Valve / EG FU
It maintains stable air delivery to service brakes, parking brakes, auxiliary systems, and suspension circuits. Built with precision internal valves and corrosion-resistant materials, it ensures reliable pressure regulation and prevents total brake loss during circuit failure. Its compact and robust construction withstands vibration, moisture, and harsh operating environments found in commercial vehicles.
By isolating faults and maintaining minimum operating pressure, the valve significantly improves braking safety, system reliability, and overall vehicle performance.
Key Features
- Controls and distributes air to four independent brake circuits
Automatically isolates faulty circuits to maintain braking safety
- Corrosion-resistant housing with precision valve mechanisms
- Ensures stable pressure regulation and quick recovery
- Essential for safe and compliant air-brake operation
Product Specifications
| GROUP | MODEL | REF. PART NUMBER | SPECIFICATIONS |
|---|---|---|---|
| 11.066 | 3128, 2523, 2528 | A4004312306 | Four-Circuit Protection Valve – EG FU – Air Brake System |
Process Steps
- Drain air from the system and ensure vehicle is secured.
- Disconnect air lines from the old protection valve.
- Remove mounting bolts and take out the valve assembly.
- Install the new Four-Circuit Protection Valve and tighten all fittings.
- Reconnect air lines following OEM port identification.
- Pressurize the system, check for leaks, and verify correct circuit operation.
FAQ
What does the four-circuit protection valve do?
It distributes air to four circuits and isolates any circuit that fails, maintaining safe brake operation.
When should it be replaced?
Replace if pressure regulation is unstable, circuits fail to charge, or internal leakage is detected.
