{"product_id":"8c4z-2k478-a-genuine-ford®-hydraulic-brake-master-cylinder-kit","title":"8C4Z-2K478-A | Genuine Ford® Hydraulic Brake Master Cylinder Kit","description":"\u003cp\u003e\u003cstrong\u003eDescription: \u003c\/strong\u003eHydraulic Brake Master Cylinder Kit\u003cbr\u003e\u003cstrong\u003eCondition: \u003c\/strong\u003eNew\u003cbr\u003e\u003cstrong\u003eBrand: \u003c\/strong\u003eWabco®\u003cbr\u003e\u003cstrong\u003ePart Number: \u003c\/strong\u003e8C4Z-2K478-A\u003cspan style=\"font-size: 0.875rem;\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eVehicle Fitment 8C4Z-2K478-A:\u003c\/strong\u003e\u003c\/p\u003e\n\u003ctable width=\"100%\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e \n\u003cp data-path-to-node=\"4\"\u003eThe Wabco HPB master cylinder kit is engineered for specific \u003cb data-path-to-node=\"4\" data-index-in-node=\"61\"\u003eInternational (Navistar)\u003c\/b\u003e and \u003cb data-path-to-node=\"4\" data-index-in-node=\"90\"\u003eWorkhorse\u003c\/b\u003e chassis that utilize a high-pressure hydraulic pump instead of a traditional brake booster.\u003c\/p\u003e\n\u003cul data-path-to-node=\"5\"\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"5,0,0\"\u003e\u003cb data-path-to-node=\"5,0,0\" data-index-in-node=\"0\"\u003eInternational 4000 Series (DuraStar):\u003c\/b\u003e Fits \u003cb data-path-to-node=\"5,0,0\" data-index-in-node=\"43\"\u003e4300 and 4400\u003c\/b\u003e models (typically years 2004–2014) equipped with the Wabco HPB unit.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"5,1,0\"\u003e\u003cb data-path-to-node=\"5,1,0\" data-index-in-node=\"0\"\u003eInternational School Buses:\u003c\/b\u003e Fits \u003cb data-path-to-node=\"5,1,0\" data-index-in-node=\"33\"\u003eIC Bus CE Series\u003c\/b\u003e (2005–2015) that use hydraulic power braking.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"5,2,0\"\u003e\u003cb data-path-to-node=\"5,2,0\" data-index-in-node=\"0\"\u003eWorkhorse Chassis:\u003c\/b\u003e Commonly used on \u003cb data-path-to-node=\"5,2,0\" data-index-in-node=\"36\"\u003eW20, W22, and W24\u003c\/b\u003e motorhome chassis (years 2004–2012) featuring Wabco braking systems.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"5,3,0\"\u003e\u003cb data-path-to-node=\"5,3,0\" data-index-in-node=\"0\"\u003eFreightliner Custom Chassis:\u003c\/b\u003e Used on certain specialized walk-in vans and step vans.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003eA Wabco Hydraulic Brake Master Cylinder Kit\u003cstrong\u003e 8C4Z-2K478-A \u003c\/strong\u003eis a precision repair set designed for the Wabco HPB (Hydraulic Power Braking) system. Unlike standard brake kits, this is engineered for a high-pressure system that replaces the traditional vacuum booster with an electric pump and nitrogen-filled accumulators.\u003c\/p\u003e\n\u003ctable width=\"100%\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e \n\u003cul\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"5,0,0\"\u003e\u003cb data-path-to-node=\"5,0,0\" data-index-in-node=\"0\"\u003eHigh-Pressure Seals:\u003c\/b\u003e Special chemical-resistant rubber seals designed to withstand the constant high pressure of the HPB pump.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"5,1,0\"\u003e\u003cb data-path-to-node=\"5,1,0\" data-index-in-node=\"0\"\u003ePrecision Pistons:\u003c\/b\u003e The primary and secondary pistons that move brake fluid into the ABS modulator.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"5,2,0\"\u003e\u003cb data-path-to-node=\"5,2,0\" data-index-in-node=\"0\"\u003eCheck Valves:\u003c\/b\u003e Integrated valves that help maintain \"standby\" pressure in the lines.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"5,3,0\"\u003e\u003cb data-path-to-node=\"5,3,0\" data-index-in-node=\"0\"\u003eO-Rings:\u003c\/b\u003e Specific rings to seal the master cylinder to the aluminum hydraulic power unit (HPU).\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eSigns of Faulty 8C4Z-2K478-A:\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003ctable width=\"100%\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e \n\u003cul data-path-to-node=\"4\"\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"4,0,0\"\u003e\u003cb data-path-to-node=\"4,0,0\" data-index-in-node=\"0\"\u003eContinuous Pump Running:\u003c\/b\u003e The most common sign. If you hear the electric pump motor (located under the cab) running for long periods or cycling on and off every few seconds without you touching the brakes, the internal seals are likely leaking, preventing the system from holding pressure.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"4,1,0\"\u003e\u003cb data-path-to-node=\"4,1,0\" data-index-in-node=\"0\"\u003e\"Brake Pressure Low\" Dash Warning:\u003c\/b\u003e The system has internal pressure sensors. If the master cylinder seals are failing, the system cannot maintain the required 1500–2000 PSI, triggering a warning light and alarm.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"4,2,0\"\u003e\u003cb data-path-to-node=\"4,2,0\" data-index-in-node=\"0\"\u003eRapid Fluid Displacement\/Aeration:\u003c\/b\u003e If the internal seals in the kit are bad, brake fluid may \"bypass\" internally, causing turbulence in the reservoir. You might see tiny air bubbles or foamy fluid in the plastic tank.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"4,3,0\"\u003e\u003cb data-path-to-node=\"4,3,0\" data-index-in-node=\"0\"\u003eYellow or Red ABS\/Brake Lights:\u003c\/b\u003e Since the master cylinder is integrated with the ABS modulator, a mechanical failure in the seals often throws an electronic fault code (DTC) related to \"Pressure Management.\"\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"4,4,0\"\u003e\u003cb data-path-to-node=\"4,4,0\" data-index-in-node=\"0\"\u003ePedal Kickback or Vibration:\u003c\/b\u003e During braking, if the seals are leaking, you may feel a strange pulsation or \"pushing back\" sensation in the pedal as the pump tries to compensate for the pressure loss.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"4,5,0\"\u003e\u003cb data-path-to-node=\"4,5,0\" data-index-in-node=\"0\"\u003eExternal Leaks at the HPU Block:\u003c\/b\u003e If you see fluid dripping from the seam where the master cylinder meets the aluminum Hydraulic Power Unit (HPU), the O-rings or rear seals in the kit have failed.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-size: 0.875rem;\"\u003e\u003cstrong\u003eManufacturer information\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-size: 0.875rem;\"\u003eWhether it’s for cars, buses, trucks, or trailers, \u003c\/span\u003e\u003cstrong style=\"font-size: 0.875rem;\"\u003eWABCO®\u003c\/strong\u003e\u003cspan style=\"font-size: 0.875rem;\"\u003e is at the frontline at developing and providing products and systems to make vehicles safer and easier to control. Founded in 1869, WABCO is a major supplier of braking, stability, suspension and transmissions in the Americas and beyond. The company is recognized as introducing the modern air brake system in 1869, and continues to lead the industry in air brake design and production for the heavy duty and commercial vehicle sectors. Today, WABCO operates as a division of the German auto parts maker ZF and employs 16,000 employees in facilities in 36 countries worldwide.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003e\u003cstrong\u003eWarranty\u003c\/strong\u003e\u003cbr\u003eFirst Truck Parts offers a \u003cstrong\u003e365-days warranty\u003c\/strong\u003e for all types of parts and in any condition. The warranty applies only to buyers who have placed an order on our website.\u003c\/p\u003e","brand":"Meritor®","offers":[{"title":"Default Title","offer_id":41285783191616,"sku":"8C4Z-2K478-A","price":252.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0601\/6342\/4320\/files\/R950055.webp?v=1782496488","url":"https:\/\/wearvico.com\/products\/8c4z-2k478-a-genuine-ford%c2%ae-hydraulic-brake-master-cylinder-kit","provider":"wearvico","version":"1.0","type":"link"}