ABS Relay Valve Fit for Wabco 4721950330 Meritor S4721950330

This ABS Relay Valve is the core component in the trailer ABS system that performs brake pressure regulation. It is a sophisticated "electro-pneumatic" device that combines the functions of a traditional relay valve and an ABS solenoid valve.The following situations are typical signs that replacement is required:1. ABS Warning Light Illuminates: The vehicle's ABS system performs a self-diagnostic check. If the ECU detects an issue with this valve or its electrical circuit, the ABS warning light on the dashboard will come on.2. Noticeable Braking Abnormalities:Wheels Prone to Locking Up: During emergency braking or on slippery surfaces, if you feel the wheels lock up and skid across the ground, it indicates that the ABS pressure modulation function has failed.Insufficient Braking Power or Delayed Response: If the brakes feel "spongy" or there is a significant delay after pressing the pedal, it may be due to damaged internal seals or a stuck piston within the valve body, resulting in imprecise air pressure control.3. External Physical Damage: The valve body shows visible cracks, deformation, or the electrical connector is loose or unreliable due to corrosion or damage.4. Substandard Performance During Vehicle Inspection or Maintenance: If the brake response time, pressure regulation, or other parameters fail to meet standards during a professional brake performance test, replacement may also be necessary.

• 【Fitment】This ABS Relay Valve Compatible with Wabco Reman Core, Meritor, Freightliner, Goldhofer, Great Dane, Hyundai, Kenworth, MAC Trailer, Mack, Manac, Navistar, Peterbilt, Stoughton, Utility Trailer, Volvo, Vanguard National, Wabash National. (Please confirm the OE number)
• 【Replace Part Number】4721950330, 472-195-033-0, S4721950330, S472-195-033-0, 650-S4721950330, WAB4721950330, AQ960503, AQ960510, R955378, 955378, 170.955378, TDAS4721950330, 167219, 40502928, AB84021, 10003392, 24900171, 6300-4721950330, 22802000, 228-02000, 46040401100, 3-9350-066, 393500066, 4721950339, RWW4721950330.
• 【Specifications】ABS modulator relay valve Specifications: Voltage: 12V; Crack pressure: 4.0 PSI; Maximum operating pressure: 10.0 bar; Supply ports: 3/4" NPT; Delivery ports: 3/8" NPT; Control port: 3/8" NPT; Dimensions: 98 × 111 × 119 mm; Temperature range: -40°C to +80°C
• 【Quality & Durability】 Manufactured from high-quality materials and undergoes rigorous factory inspections, this trailer ABS relay valve ensures high performance and long-term durability.
• 【Precise Pressure Control】 This relay valve can precisely control the brake air pressure, avoid pressure fluctuations, and ensure that the braking force is transmitted to each wheel smoothly and effectively.