{"product_id":"powerworks-pv4-brake-proportioning-valve-brass-5-port-disc-disc-adjustable-mounting-for-front-rear-balance","title":"POWERWORKS PV4 Brake Proportioning Valve — Brass 5-Port Disc\/Disc, Adjustable Mounting for Front\/Rear Balance","description":"\u003cp\u003e\u003cstrong\u003ePOWERWORKS PV4 is a universal brass combination proportioning valve designed for disc\/front and disc\/rear brake systems to balance brake pressure and reduce rear-wheel lockup.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eThis PV4 Brake Proportioning Valve by POWERWORKS is a five-port combination valve engineered to fit most vehicles that run disc brakes front and rear. Made of durable brass, the valve accepts multiple master-cylinder and brake line fittings, and can be mounted left, right or bottom for flexible installation. It provides proportional pressure distribution between front and rear circuits so the rear brakes receive appropriate force under braking, helping to minimize the chance of rear-wheel lock during heavy stops.\u003c\/p\u003e\n\n\u003ch3\u003eHow does the PV4 valve prevent rear brake lockup?\u003c\/h3\u003e\n\u003cp\u003eThe PV4 moderates hydraulic pressure between front and rear circuits so the rear calipers do not receive excessive force compared with the front. When braking force ramps up, the built-in proportioning function reduces rear line pressure relative to the front, improving balance and stability during hard stops. This is a mechanical solution that works across many vehicle setups without electronic control.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eFive-port design separates front and rear braking circuits.\u003c\/li\u003e\n  \u003cli\u003eProportioning action reduces rear pressure under heavy braking.\u003c\/li\u003e\n  \u003cli\u003eWorks continuously without power—purely hydraulic operation.\u003c\/li\u003e\n  \u003cli\u003eHelps maintain vehicle control during sudden deceleration.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat fittings and connection sizes does the PV4 use?\u003c\/h3\u003e\n\u003cp\u003eThe POWERWORKS PV4 includes standard thread sizes to match common brake plumbing. Rear brake connection uses a 9\/16\"-18 port while the front brake lines attach to dual 3\/8\"-24 ports. Master cylinder feed lines connect via 1\/2\"-20 and 7\/16\"-24 ports, covering many aftermarket and OEM configurations.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eRear brake port: 9\/16\"-18 thread for compatibility with standard fittings.\u003c\/li\u003e\n  \u003cli\u003eFront brake ports: two 3\/8\"-24 ports for dual front circuits.\u003c\/li\u003e\n  \u003cli\u003eMaster cylinder inlets: 1\/2\"-20 and 7\/16\"-24 for common MC outputs.\u003c\/li\u003e\n  \u003cli\u003eThreaded ports accept standard brake fittings and adapters when needed.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow is the PV4 mounted and installed on a vehicle?\u003c\/h3\u003e\n\u003cp\u003eThe PV4 is built for flexible mounting: it can be installed on the left, right, or bottom depending on space and line routing. Its compact brass body resists corrosion and handles brake-fluid exposure, while the five ports let you configure the plumbing for your vehicle’s layout. Installation typically requires basic brake-line tools and proper bleeding after plumbing to remove air from the system.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eMount options: left, right or bottom to fit tight engine bays.\u003c\/li\u003e\n  \u003cli\u003eBrass body offers corrosion resistance and good thermal conductivity.\u003c\/li\u003e\n  \u003cli\u003eRequires flare wrenches, line adapters if needed, and brake bleeding.\u003c\/li\u003e\n  \u003cli\u003eSold as a single PV4 unit—includes one brass combination valve.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWill this PV4 work on classic trucks and muscle cars?\u003c\/h3\u003e\n\u003cp\u003eYes—the PV4 was designed with compatibility in mind for many classic trucks, muscle cars, and modern vehicles that use disc brakes on both axles. Its common thread sizes and universal mounting make it a practical retrofit option when upgrading or maintaining disc\/disc brake setups. Verify thread sizes and line orientations before purchase to ensure a direct fit or to identify needed adapters.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eIdeal for older vehicles converting to or already using disc\/disc brakes.\u003c\/li\u003e\n  \u003cli\u003eWorks with many aftermarket master cylinders and brake line kits.\u003c\/li\u003e\n  \u003cli\u003eCan be adapted with common fittings if exact threads differ.\u003c\/li\u003e\n  \u003cli\u003eDurable brass construction suits long-term use in varied conditions.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho is this for: The POWERWORKS PV4 Brake Proportioning Valve is intended for car enthusiasts, restorers, mechanics, and DIYers who need a reliable mechanical solution to balance hydraulic pressure in disc\/disc brake systems. It suits projects ranging from classic truck and muscle-car restorations to custom builds and routine brake upgrades where consistent rear pressure reduction and flexible mounting are required. If you’re unsure about fitment, check your master-cylinder outlet and brake line thread sizes or consult a qualified technician before installation.\u003c\/p\u003e\n\u003csection class=\"product-faq-snippet\"\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Does the PV4 fit my master cylinder?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Check your master cylinder outlets—PV4 uses 1\/2\"-20 and 7\/16\"-24 inlets; adapters may be needed for other sizes.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Is the PV4 compatible with ABS systems?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: PV4 is a mechanical proportioning valve; integrate carefully with ABS-equipped systems and consult a brake specialist.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"POWERWORKS","offers":[{"title":"Default Title","offer_id":55168353829207,"sku":"B096TTYR4N","price":57.41,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1050\/1524\/7191\/files\/powerworks-pv4-front-view.jpg?v=1790401447","url":"https:\/\/britishgarage.co.uk\/products\/powerworks-pv4-brake-proportioning-valve-brass-5-port-disc-disc-adjustable-mounting-for-front-rear-balance","provider":"British Garage","version":"1.0","type":"link"}