{"product_id":"abs-trailer-modulator-relay-valve-assy-for-wabco-4721950330-meritor-s4721950330","title":"ABS Trailer Modulator Relay Valve Assy For Wabco 4721950330 Meritor S4721950330","description":"\u003ch2\u003eABS Trailer Modulator Relay Valve Assembly for Wabco, Meritor\u003c\/h2\u003e\u003cp\u003eThis ABS trailer modulator relay valve assembly controls air delivery to trailer brake chambers and directly replaces Wabco 4721950330 and Meritor S4721950330 units.\u003c\/p\u003e\u003ch4\u003eOverview\u003c\/h4\u003e\u003cp\u003eThis ABS trailer modulator relay valve assembly is a critical component in trailer air brake systems, precisely regulating air pressure during ABS events. It replaces Wabco 4721950330 and Meritor S4721950330 valves, restoring full anti-lock braking function. The ABS trailer modulator relay valve assembly ensures consistent braking performance for commercial trailers and heavy-duty fleets.\u003c\/p\u003e\u003ch4\u003eBuilt For Performance\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eFast-response solenoid valve enhances ABS cycling for shorter stopping distances\u003c\/li\u003e\n\u003cli\u003eRobust die-cast aluminum body resists corrosion from road salt and moisture\u003c\/li\u003e\n\u003cli\u003eIntegral relay function provides quick service brake application without delay\u003c\/li\u003e\n\u003cli\u003eDrop-in design matches original mounting and port locations for easy replacement\u003c\/li\u003e\n\u003cli\u003eTested to OEM pressure and cycle specifications for reliable long-term operation\u003c\/li\u003e\n\u003cli\u003eCompatible with standard 12V\/24V trailer ABS electronic control units\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eOn-The-Job Use\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eReplacing a faulty modulator valve to restore ABS function on single, tandem, or tri-axle trailers\u003c\/li\u003e\n\u003cli\u003eUsed during preventive maintenance of air brake systems on dry vans, reefers, and flatbeds\u003c\/li\u003e\n\u003cli\u003eServicing ABS-equipped tankers and construction trailers that require precise braking control\u003c\/li\u003e\n\u003cli\u003eUpgrading older trailer ABS setups to a known cross-reference valve\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eSpecs At A Glance\u003c\/h4\u003e\u003ctable\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003ePart Number(s)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e4721950330 (Wabco), S4721950330 (Meritor)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eType\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eABS Modulator Relay Valve\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eBody Material\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eAluminum\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eVoltage\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e12V\/24V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\u003ch4\u003eGood To Know\u003c\/h4\u003e\u003cp\u003e\u003cstrong\u003eQ:\u003c\/strong\u003e Will this valve work with both Wabco and Meritor ABS systems? \u003cstrong\u003eA:\u003c\/strong\u003e Yes, it is a direct replacement for the Wabco 4721950330 and Meritor S4721950330 valves, fitting standard trailer air brake configurations without modification.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eQ:\u003c\/strong\u003e Do I need to recalibrate the ABS after installing a new modulator relay valve? \u003cstrong\u003eA:\u003c\/strong\u003e In most cases, the trailer ABS self-calibrates after a few brake applications; however, on some systems a manual re-learn procedure may be required so consult the manufacturer’s guidelines.\u003c\/p\u003e\u003cp\u003e\u003cem\u003eSlight variation in finish or dimensions may occur between production runs, and fit can depend on serial number, so confirm compatibility before ordering.\u003c\/em\u003e\u003c\/p\u003e","brand":"Solid Spare","offers":[{"title":"Default Title","offer_id":44965140693078,"sku":"ZZ3A00951","price":116.59,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0697\/8460\/0662\/files\/57_55ceca14-d295-4887-9967-004a84dc26ec.jpg?v=1781654236","url":"https:\/\/www.solidspare.com\/products\/abs-trailer-modulator-relay-valve-assy-for-wabco-4721950330-meritor-s4721950330","provider":"Solid Spare","version":"1.0","type":"link"}