{"product_id":"master-cylinder-3-4","title":"AL-KO 3\/4inch Hydraulic Master Cylinder","description":"\u003cdiv class=\"flex max-w-full flex-col gap-4 grow\"\u003e\n\u003cdiv data-message-author-role=\"assistant\" data-message-id=\"52b18646-b976-4da8-aaad-1029de0419f1\" dir=\"auto\" data-message-model-slug=\"gpt-5-5\" class=\"min-h-8 text-message relative flex w-full flex-col items-end gap-2 text-start break-words whitespace-normal outline-none keyboard-focused:focus-ring [.text-message+\u0026amp;]:mt-1\" data-turn-start-message=\"true\" tabindex=\"0\"\u003e\n\u003cdiv class=\"flex w-full flex-col gap-1 empty:hidden\"\u003e\n\u003cdiv class=\"markdown prose dark:prose-invert wrap-break-word w-full light markdown-new-styling\"\u003e\n\u003cp data-start=\"0\" data-end=\"468\" class=\"PDq2pG_selectionAnchorContainer\"\u003eThe \u003cstrong data-start=\"4\" data-end=\"61\"\u003eHydraulic Trailer Master Cylinder – Override Coupling\u003c\/strong\u003e is a high-quality replacement master cylinder designed for hydraulic override trailer braking systems. Available in \u003cstrong data-start=\"178\" data-end=\"186\"\u003e3\/4\"\u003c\/strong\u003e, \u003cstrong data-start=\"188\" data-end=\"196\"\u003e7\/8\"\u003c\/strong\u003e, and \u003cstrong data-start=\"202\" data-end=\"208\"\u003e1\"\u003c\/strong\u003e bore sizes, it suits single, tandem, and tri-axle trailers fitted with 2,000kg override couplings. Designed for use with hydraulic drum or disc brake systems, it delivers smooth and reliable brake actuation when paired with correctly bled and adjusted brakes.\u003cspan aria-hidden=\"true\" class=\"PDq2pG_selectionAnchor\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp data-start=\"470\" data-end=\"581\"\u003eSelecting the correct bore size ensures optimal braking performance based on your trailer's axle configuration.\u003c\/p\u003e\n\u003cp data-start=\"583\" data-end=\"596\"\u003e\u003cstrong data-start=\"583\" data-end=\"596\"\u003eFeatures:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul data-start=\"597\" data-end=\"1067\"\u003e\n\u003cli data-section-id=\"1henoyg\" data-start=\"597\" data-end=\"647\"\u003eSuits hydraulic override trailer braking systems\u003c\/li\u003e\n\u003cli data-section-id=\"1lemppo\" data-start=\"648\" data-end=\"692\"\u003eCompatible with 2,000kg override couplings\u003c\/li\u003e\n\u003cli data-section-id=\"1ade8ju\" data-start=\"693\" data-end=\"749\"\u003eAvailable in \u003cstrong data-start=\"708\" data-end=\"716\"\u003e3\/4\"\u003c\/strong\u003e, \u003cstrong data-start=\"718\" data-end=\"726\"\u003e7\/8\"\u003c\/strong\u003e, and \u003cstrong data-start=\"732\" data-end=\"738\"\u003e1\"\u003c\/strong\u003e bore sizes\u003c\/li\u003e\n\u003cli data-section-id=\"1ayvwtv\" data-start=\"750\" data-end=\"812\"\u003eSuitable for hydraulic drum and hydraulic disc brake systems\u003c\/li\u003e\n\u003cli data-section-id=\"qjhlyz\" data-start=\"813\" data-end=\"869\"\u003eDesigned for use with 14\", 15\", and 16\" trailer wheels\u003c\/li\u003e\n\u003cli data-section-id=\"1yzbdie\" data-start=\"870\" data-end=\"942\"\u003eHeavy-duty construction for reliable performance and long service life\u003c\/li\u003e\n\u003cli data-section-id=\"1e81k8c\" data-start=\"943\" data-end=\"999\"\u003eCompatible with flexible braided hydraulic brake hoses\u003c\/li\u003e\n\u003cli data-section-id=\"hrfzib\" data-start=\"1000\" data-end=\"1067\"\u003eEasy installation using a zinc mounting bracket (sold separately)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"1069\" data-end=\"1102\"\u003e\u003cstrong data-start=\"1069\" data-end=\"1102\"\u003eMaster Cylinder Applications:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul data-start=\"1103\" data-end=\"1355\"\u003e\n\u003cli data-section-id=\"1bfmkd2\" data-start=\"1103\" data-end=\"1182\"\u003e\n\u003cstrong data-start=\"1105\" data-end=\"1118\"\u003e3\/4\" Bore\u003c\/strong\u003e – Suits single axle trailers with two hydraulic wheel cylinders\u003c\/li\u003e\n\u003cli data-section-id=\"1ovgzip\" data-start=\"1183\" data-end=\"1263\"\u003e\n\u003cstrong data-start=\"1185\" data-end=\"1198\"\u003e7\/8\" Bore\u003c\/strong\u003e – Suits tandem axle trailers with four hydraulic wheel cylinders\u003c\/li\u003e\n\u003cli data-section-id=\"1sh4pr9\" data-start=\"1264\" data-end=\"1355\"\u003e\n\u003cstrong data-start=\"1266\" data-end=\"1277\"\u003e1\" Bore\u003c\/strong\u003e – Suits tri-axle trailers up to 4.5 tonnes with six hydraulic wheel cylinders\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"1357\" data-end=\"1380\"\u003e\u003cstrong data-start=\"1357\" data-end=\"1380\"\u003eInstallation Notes:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul data-start=\"1381\" data-end=\"1753\"\u003e\n\u003cli data-section-id=\"pwdsfm\" data-start=\"1381\" data-end=\"1463\"\u003eMounts using a hydraulic master cylinder bracket with \u003cstrong data-start=\"1437\" data-end=\"1463\"\u003e54mm bolt hole centres\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli data-section-id=\"f1dvxu\" data-start=\"1464\" data-end=\"1554\"\u003eInstall the bracket using suitable 1\/2\" bolts through the bracket, coupling, and drawbar\u003c\/li\u003e\n\u003cli data-section-id=\"96n709\" data-start=\"1555\" data-end=\"1605\"\u003eDisconnect the parking brake during installation\u003c\/li\u003e\n\u003cli data-section-id=\"1k32say\" data-start=\"1606\" data-end=\"1753\"\u003eAfter bleeding the brake system, adjust the lower nut to approximately \u003cstrong data-start=\"1679\" data-end=\"1686\"\u003e2mm\u003c\/strong\u003e from the rear of the override mechanism before locking it in place\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"1755\" data-end=\"1785\"\u003e\u003cstrong data-start=\"1755\" data-end=\"1785\"\u003eBrake Fluid Compatibility:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul data-start=\"1786\" data-end=\"2014\" data-is-last-node=\"\" data-is-only-node=\"\"\u003e\n\u003cli data-section-id=\"wysh48\" data-start=\"1786\" data-end=\"1831\"\u003eUse \u003cstrong data-start=\"1792\" data-end=\"1801\"\u003eDOT 3\u003c\/strong\u003e or \u003cstrong data-start=\"1805\" data-end=\"1814\"\u003eDOT 4\u003c\/strong\u003e brake fluid only\u003c\/li\u003e\n\u003cli data-section-id=\"ml1465\" data-start=\"1832\" data-end=\"2014\" data-is-last-node=\"\"\u003e\n\u003cstrong data-start=\"1834\" data-end=\"1854\"\u003eDo not use DOT 5\u003c\/strong\u003e brake fluid unless specifically recommended by the brake system manufacturer, as silicone-based DOT 5 fluid can damage seals and cause caliper pistons to bind.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"AL-KO","offers":[{"title":"Default Title","offer_id":58162368217248,"sku":"313001","price":49.1,"currency_code":"AUD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0717\/2177\/9360\/files\/313001-ALK.jpg?v=1783899917","url":"https:\/\/caraseltrailers.com.au\/products\/master-cylinder-3-4","provider":"Carasel","version":"1.0","type":"link"}