Skip to product information
4721950330 ABS Trailer Modulator Relay Valve Assy For Wabco Meritor S4721950330
$116.59
Sale price
$116.59
Regular price
Quantity
Pickup currently not available
Secure Checkout • Encrypted Payments
Free Shipping
Contiguous U.S.
1-Year Warranty
Parts you can rely on
30-Day Returns
Hassle-free returns
Need help confirming fitment?
Talk with a parts expert today.
Parts Support Hours: Monday–Friday, 8:00 AM–5:00 PM CT
Live Chat: Available 24/7
I needed a forklift part and wasn’t sure which one fit. They asked for the model and serial number, got back to me quickly, and made sure I ordered the right one. Really helpful.
Randy W. — Verified customer
Equipment Fitment
Review the equipment and model information below. Fitment can vary by serial number, production date, or machine configuration, so confirm your model and reference numbers before ordering.
Equipment / model
Product Overview
This ABS trailer modulator relay valve assembly controls air pressure modulation to trailer brakes during antilock braking events. It is a direct replacement for Wabco 4721950330 and Meritor S4721950330 part numbers, ensuring reliable braking performance on heavy-duty trailers.
Key Features & Performance
- Direct fit replacement for OEM Wabco and Meritor modulator valves
- Integrated relay and modulator function in one unit
- Improves trailer brake response and stability during ABS activation
- Built to meet OEM specifications for air brake systems
- Includes mounting bracket and electrical connector
Common Uses
- Replacing failed or worn ABS modulator valves on semi-trailers
- Servicing air brake systems on heavy-duty trailers and trucks
- Integrating into Wabco or Meritor ABS-equipped trailers
Technical Specifications
- Part Number(s): 4721950330 (Wabco), S4721950330 (Meritor)
- Type: ABS Modulator Relay Valve Assembly
- Pressure Rating: 150 PSI max.
- Port Sizes: SAE and NPT compatible
Frequently Asked Questions
Q: Will this valve work with my Meritor WABCO trailer ABS system? A: Yes, it is designed as a direct cross-reference for both Wabco 4721950330 and Meritor S4721950330 part numbers.
Q: Does this assembly include the electrical solenoid connector? A: Yes, the valve comes with the required electrical connector for plug-and-play installation.
Product appearance and specifications may vary slightly by batch. Compatibility may vary by serial number. Verify fitment before purchase.