{"id":6042,"date":"2026-05-18T20:55:13","date_gmt":"2026-05-18T20:55:13","guid":{"rendered":"https:\/\/automotivebrakeandclutch.com\/index.php\/product\/new-brake-master-cylinder-1-1-4-inch-bore-size-fe21721-5454330-21721c\/"},"modified":"2026-05-18T20:55:13","modified_gmt":"2026-05-18T20:55:13","slug":"new-brake-master-cylinder-1-1-4-inch-bore-size-fe21721-5454330-21721c","status":"publish","type":"product","link":"https:\/\/automotivebrakeandclutch.com\/index.php\/product\/new-brake-master-cylinder-1-1-4-inch-bore-size-fe21721-5454330-21721c\/","title":{"rendered":"New Brake Master Cylinder 1-1\/4-inch bore size FE21721 5454330 21721C"},"content":{"rendered":"<div class=\"product-container\" style=\"font-family: 'Helvetica Neue', Helvetica, Arial, sans-serif; line-height: 1.6; color: #333; max-width: 900px; margin: 0 auto; border: 1px solid #eee; padding: 30px; border-radius: 8px; box-shadow: 0 4px 12px rgba(0,0,0,0.05);\">\n<h1 class=\"product-title\" style=\"color: #111; font-size: 28px; margin-bottom: 5px; letter-spacing: -0.5px;\">New Brake Master Cylinder 1-1\/4-inch bore size FE21721 5454330 21721C<\/h1>\n<p class=\"brand-slogan\" style=\"font-weight: bold; color: #666; margin-bottom: 25px; text-transform: uppercase; font-size: 13px; letter-spacing: 1px;\">Bexar Pro Components: Heavy-Duty Reliability for Fleet &amp; Industry.<\/p>\n<div class=\"product-description\" style=\"margin-bottom: 25px; font-size: 16px;\">Restore your braking system to peak performance with the <strong>M2169866<\/strong> Master Cylinder from <strong>Bexar Pro Components<\/strong>. Engineered with a precision 1-1\/4-inch bore and high-grade materials, this unit is built for the rugged demands of <strong>heavy-duty fleet reliability<\/strong>, making it the ideal solution for both <strong>industrial equipment<\/strong> and <strong>automotive applications<\/strong>.<\/div>\n<h2 style=\"font-size: 18px; border-bottom: 2px solid #c00000; padding-bottom: 5px; color: #000; margin-bottom: 15px;\">Key Specifications &amp; Expert Features<\/h2>\n<ul class=\"feature-list\" style=\"list-style: none; padding: 0; margin: 0 0 25px 0;\">\n<li style=\"padding: 10px 0; border-bottom: 1px solid #eee;\"><strong>Bore Diameter:<\/strong> 1-1\/4-inch bore size (High-volume fluid displacement)<\/li>\n<li style=\"padding: 10px 0; border-bottom: 1px solid #eee;\"><strong>Outlet Size:<\/strong> 7\/16-26 INV (Standard inverted flare connection)<\/li>\n<li style=\"padding: 10px 0; border-bottom: 1px solid #eee;\"><strong>Application:<\/strong> Heavy-duty commercial trucks and industrial machinery.<\/li>\n<li style=\"padding: 10px 0;\"><strong>Companion Repair Kit:<\/strong> <a style=\"color: #c00000; font-weight: bold; text-decoration: none;\" href=\"https:\/\/automotivebrakeandclutch.com\/product\/mc-kit-33mk\/\">33MK (View Compatible Kit)<\/a><\/li>\n<\/ul>\n<h2 style=\"font-size: 18px; color: #000; margin-bottom: 10px;\">Verified Casting &amp; Part Numbers<\/h2>\n<p style=\"margin-bottom: 15px;\">Matching your existing part number is the most reliable method to ensure correct fitment. This unit replaces:<\/p>\n<ul class=\"casting-numbers\" style=\"list-style: none; padding: 0; margin: 0 0 30px 0; display: flex; flex-wrap: wrap; gap: 10px; font-family: monospace; font-size: 16px; font-weight: bold;\">\n<li style=\"background: #f4f4f4; padding: 6px 12px; border-radius: 4px; border-left: 4px solid #c00000; box-shadow: 2px 2px 5px rgba(0,0,0,0.05);\">FE21721<\/li>\n<li style=\"background: #f4f4f4; padding: 6px 12px; border-radius: 4px; border-left: 4px solid #c00000; box-shadow: 2px 2px 5px rgba(0,0,0,0.05);\">5454330<\/li>\n<li style=\"background: #f4f4f4; padding: 6px 12px; border-radius: 4px; border-left: 4px solid #c00000; box-shadow: 2px 2px 5px rgba(0,0,0,0.05);\">21721C<\/li>\n<li style=\"background: #f4f4f4; padding: 6px 12px; border-radius: 4px; border-left: 4px solid #c00000; box-shadow: 2px 2px 5px rgba(0,0,0,0.05);\">618108<\/li>\n<li style=\"background: #f4f4f4; padding: 6px 12px; border-radius: 4px; border-left: 4px solid #c00000; box-shadow: 2px 2px 5px rgba(0,0,0,0.05);\">3773856<\/li>\n<li style=\"background: #f4f4f4; padding: 6px 12px; border-radius: 4px; border-left: 4px solid #c00000; box-shadow: 2px 2px 5px rgba(0,0,0,0.05);\">FD21721<\/li>\n<\/ul>\n<div style=\"background: #fcfcfc; border: 1px solid #e5e5e5; padding: 25px; border-radius: 6px; margin-bottom: 30px;\">\n<h3 style=\"font-size: 17px; margin-top: 0; color: #c00000; text-transform: uppercase; letter-spacing: 0.5px;\">Expert Installation &amp; Field Note<\/h3>\n<p style=\"margin-bottom: 0; font-size: 15px; line-height: 1.5;\">Based on our shop experience specializing in heavy-duty brakes since 1985: The 1-1\/4-inch bore size is designed for high-pressure requirements in commercial and industrial settings. Pushrod alignment is absolutely critical to prevent seal scoring. When installing on heavy equipment, ensure the pushrod is perfectly centered within the piston pocket. Always perform a complete system bleed using fresh DOT fluid following installation.<\/p>\n<\/div>\n<div style=\"border: 2px solid #c00000; padding: 20px; background-color: #fffafa; border-radius: 4px; margin-bottom: 35px;\">\n<h4 style=\"color: #c00000; margin-top: 0; font-size: 16px; text-transform: uppercase;\">\u26a0 CRITICAL: Verify Specifications<\/h4>\n<p style=\"margin-bottom: 0; font-size: 15px;\">To ensure safety, verify that this master cylinder\u2019s <strong>1-1\/4-inch bore size<\/strong> and <strong>7\/16-26 INV outlet<\/strong> match your existing unit exactly before purchasing.<\/p>\n<\/div>\n<div class=\"sleek-banner\" style=\"display: flex; align-items: stretch; border-radius: 6px; overflow: hidden; background: #c00000; min-height: 120px; border: 1px solid #c00000;\">\n<div style=\"background: #ffffff; padding: 20px; flex: 1; display: flex; justify-content: center; align-items: center; border: 8px solid #c00000;\"><img decoding=\"async\" style=\"width: 240px; height: auto; max-width: 100%;\" src=\"2026\/03\/bexar-pro-01-1.png\" alt=\"Bexar Pro Components\" \/><\/div>\n<div style=\"flex: 1.2; padding: 25px; color: #ffffff; display: flex; flex-direction: column; justify-content: center; text-align: left; background: #c00000;\">\n<p style=\"margin: 0; font-size: 13px; text-transform: uppercase; opacity: 0.9; letter-spacing: 1.5px; font-weight: 600;\">Bexar Pro Components<\/p>\n<p style=\"margin: 0; font-size: 28px; font-weight: 800; letter-spacing: 1px; color: #ffffff; text-shadow: 1px 1px 2px rgba(0,0,0,0.2);\">SKU: M2169866<\/p>\n<\/div>\n<\/div>\n<div style=\"text-align: center; margin-top: 25px;\"><a class=\"cta-button\" style=\"background: #333; color: #fff; padding: 14px 28px; text-decoration: none; border-radius: 4px; font-weight: bold; display: inline-block; font-size: 14px;\" href=\"https:\/\/automotivebrakeandclutch.com\/master-cylinder-replacement\/\">Official Master Cylinder Installation Guide<\/a><\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>New Brake Master Cylinder 1-1\/4-inch bore size FE21721 5454330 21721C Bexar Pro Components: Heavy-Duty Reliability for Fleet &amp; Industry. Restore your braking system to peak performance with the M2169866 Master Cylinder from Bexar Pro Components. Engineered with a precision 1-1\/4-inch bore and high-grade materials, this unit is built for the rugged demands of heavy-duty fleet<\/p>\n","protected":false},"featured_media":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_coblocks_attr":"","_coblocks_dimensions":"","_coblocks_responsive_height":"","_coblocks_accordion_ie_support":""},"product_brand":[18],"product_cat":[21,17],"product_tag":[],"class_list":{"0":"post-6042","1":"product","2":"type-product","3":"status-publish","5":"product_brand-bexar-pro-componets","6":"product_cat-brake-master-cylinders","7":"product_cat-view-all-products","9":"first","10":"instock","11":"taxable","12":"shipping-taxable","13":"purchasable","14":"product-type-simple"},"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.6 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>M2169866 Brake Master Cylinder | 1-1\/4-inch Bore | Bexar Pro Components<\/title>\n<meta name=\"description\" content=\"Buy the M2169866 Heavy-Duty Master Cylinder from Bexar Pro. 1-1\/4-inch bore size for industrial &amp; automotive fleets. 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