{"product_id":"wilwood-adjustable-proportioning-valve-for-brake-bias-silver-forged-billet-100-1000-psi-fine-thread-knob","title":"Wilwood Adjustable Proportioning Valve for Brake Bias — Silver Forged-Billet, 100–1000 PSI Fine-Thread Knob","description":"\u003cstrong\u003eWilwood 260-8419 is a compact forged-billet adjustable proportioning valve with a precision knurled knob that meters rear brake line pressure from 100 to 1000 PSI.\u003c\/strong\u003e\n\nThis compact unit modernizes classic brake bias control by combining a lightweight forged-billet body with fine-thread adjustability to let you tune front-to-rear braking balance. The valve accepts standard 1\/8-27 NPT ports and ships with two adapter fittings to interface with common domestic 3\/16\" hard brake lines, making it a practical swap-in for performance streetcars, track machines, and custom brake systems.\n\n\u003ch3\u003eHow precise is the pressure adjustment on this valve?\u003c\/h3\u003e\n\u003cp\u003eThe 260-8419 offers a wide, predictable range of metering from roughly 100 up to 1000 PSI, and its fine-thread adjuster knob allows incremental tuning so you can dial in brake bias without abrupt changes. The design permits up to a 57% reduction in rear line pressure at full adjustment, which is larger than most comparable units.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eAdjustment span: approximately 100–1000 PSI\u003c\/li\u003e\n  \u003cli\u003eMaximum proportional reduction: up to 57% of line pressure\u003c\/li\u003e\n  \u003cli\u003eFine-thread knob for small, repeatable changes\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat are the physical and mounting details I need to know?\u003c\/h3\u003e\n\u003cp\u003eThe valve is engineered as a lightweight, durable billet assembly weighing about 5.2 ounces, ideal where low mass and strength matter. It includes two .25\" side mounting holes set 1.00\" apart for compact mounting locations and standard 1\/8-27 NPT inlet\/outlet threads.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eWeight: ~5.2 ounces (lightweight)\u003c\/li\u003e\n  \u003cli\u003eMounting: two 0.25\" side holes spaced 1.00\" apart\u003c\/li\u003e\n  \u003cli\u003ePorts: 1\/8-27 NPT inlet and outlet\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWill it connect to my existing brake lines and fittings?\u003c\/h3\u003e\n\u003cp\u003eYes — the valve ships with two 1\/8-27 NPT to 3\/8-24 inverted flare female adapters, which fit most domestic 3\/16\" hard brake lines and common fittings used in aftermarket and OEM systems. That makes installation straightforward in many builds; adapters let you avoid custom tubing in most cases.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eIncluded fittings: two 1\/8-27 NPT to 3\/8-24 inverted flare female adapters\u003c\/li\u003e\n  \u003cli\u003eCompatibility: suited for most domestic 3\/16\" hard brake lines\u003c\/li\u003e\n  \u003cli\u003eThread type: standard NPT inlet\/outlet for broad fitment\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow does the knob and build quality affect long-term use?\u003c\/h3\u003e\n\u003cp\u003eThe machined adjuster knob uses fine threads for repeatable, vibration-resistant settings and a tactile feel for precise bias changes. The forged billet construction resists deformation under clamp loads and heat, providing consistent operation across seasons and track sessions.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eConstruction: forged billet for strength and stability\u003c\/li\u003e\n  \u003cli\u003eAdjuster: fine-thread knob for reliable, repeatable settings\u003c\/li\u003e\n  \u003cli\u003eServiceability: standard fittings and ports simplify replacement or rework\u003c\/li\u003e\n\u003c\/ul\u003e\n\nWho is this for?\n\nThis Wilwood proportioning valve is built for drivers and technicians who need compact, accurate brake bias control without heavy plumbing or complex electronics. It suits performance street vehicles, race cars, and custom builds where weight, space, and precise manual adjustment matter. If you want an easy-to-install, high-range metering valve with durable machined construction and common fittings included, the 260-8419 is designed for that role.\n\u003csection class=\"product-faq-snippet\"\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: What pressure range does this Wilwood proportioning valve cover?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: The valve meters pressure from roughly 100 to 1000 PSI, allowing up to a 57% decrease in rear line pressure.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Are fittings included for standard brake lines?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes, it includes two 1\/8-27 NPT to 3\/8-24 inverted flare female fittings for most domestic 3\/16\" hard lines.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"Wilwood","offers":[{"title":"Default Title","offer_id":48081119117470,"sku":"B002G37IEA","price":77.66,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0781\/2041\/9486\/files\/wilwood-front-view-adjustable-proportioning-valve.jpg?v=1785796642","url":"https:\/\/northtrailauto.ca\/products\/wilwood-adjustable-proportioning-valve-for-brake-bias-silver-forged-billet-100-1000-psi-fine-thread-knob","provider":"North Trail Auto","version":"1.0","type":"link"}