{"product_id":"mpa-electrical-b3781-power-brake-booster","title":"MPA Electrical B3781 Power Brake Booster","description":"\u003ch2\u003eRemanufactured Vacuum Brake Booster\u003c\/h2\u003e\u003cp\u003eMPA Electrical B3781 is a remanufactured vacuum power brake booster built for standard replacement service. It is engineered to deliver strong braking assist with low pedal effort, using a 10.56-inch diaphragm, a metal housing, and a vacuum booster design for consistent pressure transfer.\u003c\/p\u003e\u003cp\u003eThis MPA Electrical brake booster line is built for drivers who need a direct replacement unit that restores pedal feel and braking response. The B3781 is supplied without a master cylinder, and it uses 2 mounting studs with an 8 x 1.25 mm master cylinder stud thread size.\u003c\/p\u003e\u003ch2\u003eKey Features\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003ePart number B3781 remanufactured vacuum power brake booster\u003c\/li\u003e\n\u003cli\u003eStandard replacement brake service grade\u003c\/li\u003e\n\u003cli\u003e10.56-inch diaphragm diameter for braking assist\u003c\/li\u003e\n\u003cli\u003eMetal housing construction\u003c\/li\u003e\n\u003cli\u003e2 mounting studs\u003c\/li\u003e\n\u003cli\u003eMaster cylinder not included\u003c\/li\u003e\n\u003cli\u003eBrake pedal rod extension not included\u003c\/li\u003e\n\u003cli\u003eGasket or seal not included\u003c\/li\u003e\n\u003cli\u003eFront seal not included\u003c\/li\u003e\n\u003cli\u003eMounting bracket not included\u003c\/li\u003e\n\u003cli\u003e8 x 1.25 mm master cylinder stud thread size\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eDetailed Description\u003c\/h2\u003e\u003cp\u003eMPA Electrical B3781 is a reman vac power brake booster designed for vehicles that use a vacuum-assisted braking system. The remanufactured construction combines new replacement and specially treated components to help maintain vacuum seal integrity, pressure transfer, and overall braking performance. Each unit is end-of-line tested with proprietary equipment before release.\u003c\/p\u003e\u003cp\u003eFor shoppers searching for a reman vacuum brake booster for Honda Civic, Acura, or other vehicle-specific brake repair needs, B3781 provides a direct replacement format focused on restoring pedal assist and brake response. This part cross-references Monroe Shocks \u0026amp; Struts (e.g., 172286) for the same application.\u003c\/p\u003e\u003ch2\u003eCommon Repair Symptoms\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eHard brake pedal feel\u003c\/li\u003e\n\u003cli\u003eReduced braking assist from the vacuum booster\u003c\/li\u003e\n\u003cli\u003eLonger stopping distance caused by poor pedal response\u003c\/li\u003e\n\u003cli\u003eVacuum leak symptoms around the brake booster\u003c\/li\u003e\n\u003cli\u003eBrake pedal effort that feels higher than normal\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eInstallation Notes and Tips\u003c\/h2\u003e\u003cp\u003eVerify the master cylinder stud thread size, mounting stud layout, and booster depth before installation. Because the master cylinder is not included, transfer or replace the master cylinder separately as needed. Confirm vacuum hose condition, pedal linkage alignment, and firewall fitment during brake system service. Fits only the vehicle applications listed in the catalog data for this part number.\u003c\/p\u003e\u003ch2\u003eQuality Assurance\u003c\/h2\u003e\u003cp\u003eMPA Electrical subjects each brake booster to 100% end-of-line testing using proprietary test equipment. The remanufacturing process uses new replacement and specially treated components to support vacuum sealing and pressure transfer consistency.\u003c\/p\u003e","brand":"MPA Electrical","offers":[{"title":"Default Title","offer_id":52725013708981,"sku":"FQTW-B3781","price":388.1,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0628\/1442\/1173\/files\/MV_B3781_Fro.jpg?v=1782022430","url":"https:\/\/www.partcatalog.com\/products\/mpa-electrical-b3781-power-brake-booster","provider":"PartCatalog","version":"1.0","type":"link"}