Buy WAB4721950520 - Genuine Wabco ABS Solenoid Modulator Valve - wisentpartscenter.com

Description

The Genuine WABCO ABS Solenoid Modulator Valve S4721950520 controls air brake pressure in commercial vehicle anti-lock braking systems. This electronically operated valve adjusts brake pressure during ABS activation to help prevent wheel lockup and maintain vehicle stability during braking.

Fitment / Applications

  • Brake System: WABCO Pneumatic Anti-Lock Braking System (ABS)
  • Application: Standalone tractor ABS modulator valve
  • Operating Voltage: 12V DC
  • Electrical Connection: Bayonet-style, DIN 72585 A1-3.1-Sn/K1
  • Air Inlet Port: 1/2"-14 NPTF
  • Air Outlet Port: 1/2"-14 NPTF
  • Maximum Operating Pressure: 159.5 PSI (11 bar)
  • Mounting: 2 × 8.5 mm mounting holes

What's Included

  • 1 × Genuine WABCO ABS Solenoid Modulator Valve

Note: Verify fitment with us before ordering to ensure the correct part for your application.

Purpose of the Part

The ABS solenoid modulator valve controls air pressure delivered to the brake chambers during braking. When the ABS detects possible wheel lockup, the valve adjusts brake pressure to help maintain traction, steering control, and vehicle stability.

Issue Symptoms / When to Replace

Possible signs of ABS modulator valve problems may include:

  • ABS warning light remaining illuminated
  • ABS modulator valve-related fault codes
  • Air leakage around the modulator valve
  • Irregular ABS operation during braking
  • Wheel lockup during hard braking

These symptoms may also be caused by wheel speed sensors, wiring, air system faults, or other ABS components. Proper diagnosis is recommended before replacing the valve.

Brand Information

WABCO has been a pioneer in commercial vehicle braking technology for decades. In 1981, WABCO began series production of electronic ABS systems developed in cooperation with Mercedes-Benz. Its ABS solenoid modulator valves are part of this braking technology, providing precise air pressure control to help maintain vehicle stability during braking.

Installation Notes
  • Air Pressure: Depressurize the affected air brake circuit before disconnecting the valve.
  • Air Connections: Connect the supply line to Port 1 and brake chamber delivery line to Port 2.
  • System Testing: Check for air leaks and verify ABS modulator operation after installation.

How to Identify an OEM Part

Look for the WABCO name and original part number stamped on the metal identification plate.

Why Buy S4721950520 From Wisent Parts Center?

  • 1 Year
    Warranty

  • Genuine Parts

    Authentic OEM parts

  • 30-Day Returns

    Conditions apply

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Warranty & Return Information
Warranty Information

Wisent Parts offers a 1-year warranty on all parts from the date of delivery. This warranty covers orders placed directly through our website. If a part fails during this period, we’re here to help - whether it’s a replacement, repair, or refund. For full details, refer to the Warranty page.

Return Information

Wisent Parts accepts returns within 30 days of delivery. All returns are subject to a restocking fee. To qualify, parts must be unused and in their original condition. For full return instructions and restocking fee details, please refer to the Returns page.