303.02.0099 4-Circuit Protection Valve Compatible
303.02.0099
Summary
High-performance 4-circuit protection valve designed for heavy commercial vehicle pneumatic brake systems. Features M22x1.5 and M16x1.5 ports with specific opening pressures to ensure precise air distribution and circuit isolation for Mercedes-Benz, MAN, Scania, and other heavy vehicles. Equivalent to OE Alexander Dennis 659642, Faun 99707007408 and Iveco 5801114316.
| EAN Code | 8683457009578 |
|---|
Ready to Order
Compatible OEM Codes
-
MAN
- 81.52151-9094
- 81.52151-6094
-
WABCO
- 934 714 110 0
-
SCANIA
- 1935513
-
OTOKAR
- 95A0008028AA
-
MERCEDES BENZ
- 003 431 75 06
-
LEYLAND
- 445332024
-
KING LONG
- 235500880
-
IVECO
- 5801114316
-
FAUN
- 99707007408
-
ALEXANDER DENNIS
- 659642
Description
What does a 4-circuit protection valve do?
This 4-circuit protection valve is 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, ensuring that a pressure loss in one area does not compromise the entire braking performance. Built with high-strength components, it provides essential reliability for heavy-duty operations.Vehicle and system compatibility
This component is compatible with Mercedes-Benz, MAN, Scania, Iveco, Otokar, Faun, Alexander Dennis, King Long, and Leyland vehicles. It is also designed to work seamlessly within WABCO systems to maintain optimal pressure regulation across all active braking lines.Installation and technical specifications
Installation requires careful attention to the specific port requirements: Port 1 features an M22x1.5 thread, while Ports 21 through 24 utilize M16x1.5 threads. Technicians should verify that the opening pressures—ranging from 6.9 BAR to 7 BAR depending on the circuit—match the vehicle's technical requirements during replacement to ensure safe operation.Maintenance and troubleshooting
Regular inspection of the valve ports and pressure settings is recommended to prevent system failures. Maintaining clean air lines helps protect the internal diaphragms and ensures the valve responds correctly to pressure changes in the braking system.OE cross-reference
303.02.0099 (4-circuit protection valve) is the equivalent of the Alexander Dennis, Faun, Iveco, King Long, Leyland, MAN, Mercedes-Benz, Otokar, Scania and WABCO OE numbers. This part directly replaces Alexander Dennis OE number 659642. It also replaces Faun OE number 99707007408, Iveco OE number 5801114316, King Long OE number 235500880, Leyland OE number 445332024, MAN OE numbers 81521516094, 81521519094, Mercedes-Benz OE number 0034317506, Otokar OE number 95A0008028AA, Scania OE number 1935513 and WABCO OE number 9347141100.Technical Specifications
| Port 1 | M22x1,5 |
|---|---|
| Port 21 | M16x1,5 |
| Port 22 | M16x1,5 |
| Port 23 | M16x1,5 |
| Port 24 | M16x1,5 |
| Opening Pressure 21 | 6,9 BAR |
| Opening Pressure 22 | 6,9 BAR |
| Opening Pressure 23 | 6,9 BAR |
| Opening Pressure 24 | 7 BAR |
| Closing Pressure 21 | 6,4 BAR |
| Closing Pressure 22 | 6,4 BAR |
| Closing Pressure 23 | 5 BAR |
| Closing Pressure 24 | 5 BAR |
Other OEMs
ALEXANDER DENNIS
- 659642
FAUN
- 99707007408
IVECO
- 5801114316
KING LONG
- 235500880
LEYLAND
- 445332024
MAN
- 81521519094
- 81521516094
- 81.52151-9094
- 81.52151-6094
MERCEDES BENZ
- A0034317506
- 003 431 75 06
OTOKAR
- 95A0008028AA
SCANIA
- 1935513
WABCO
- 9347141100
- 934 714 110 0
Compatible Vehicles
| Brand | Model | Model Type | Engine |
|---|---|---|---|
| ALEXANDER DENNIS | |||
| FAUN | |||
| IVECO | |||
| KING LONG | |||
| LEYLAND | |||
| MAN | |||
| MERCEDES BENZ | |||
| OTOKAR | |||
| SCANIA | |||
| WABCO |
FAQ
What is the primary function of this protection valve?
It distributes pressurized air from the compressor to four separate circuits and isolates any circuit experiencing a pressure loss to maintain braking safety.
Which vehicle makes are compatible with this part?
This valve is compatible with Mercedes-Benz, MAN, Scania, Iveco, Otokar, Faun, Alexander Dennis, King Long, and Leyland heavy commercial vehicles.
What are the thread specifications for the ports?
The unit features one M22x1.5 port (Port 1) and four M16x1.5 ports (Ports 21, 22, 23, and 24).
How can I identify if the valve needs replacement?
Technicians should look for symptoms of uneven braking or pressure drops in specific circuits that do not resolve after checking lines.
What are the OE reference numbers of this part?
303.02.0099 directly replaces Alexander Dennis OE number 659642. It also replaces Faun OE number 99707007408, Iveco OE number 5801114316, King Long OE number 235500880, Leyland OE number 445332024, MAN OE numbers 81521516094, 81521519094, Mercedes-Benz OE number 0034317506, Otokar OE number 95A0008028AA, Scania OE number 1935513 and WABCO OE number 9347141100.