#4 Str to #4 Str 50in Brake Hose

The XRP-XTREME RACING PROD. #4 Str to #4 Str 50in Brake Hose (part number 640050) is a purpose-built hydraulic line engineered for high-performance braking systems where precision, durability, and reliability are non-negotiable. At 50 inches in length with 4 AN (AN4) straight female connections on both ends, this hose delivers the flow capacity and thread compatibility required for custom brake installations in racing vehicles, off-road platforms, and specialized automotive applications.

The hose features braided stainless steel construction with a PTFE (polytetrafluoroethylene) inner lining—a combination that resists corrosion from moisture and salt exposure while maintaining structural integrity under high pressure cycles. PTFE lining is critical in brake systems because it provides superior chemical compatibility with DOT 3, DOT 4, and DOT 5.1 brake fluids while reducing friction and improving pedal feel. The braided stainless outer layer adds mechanical protection against abrasion and impact damage that hoses encounter in engine bays and suspension environments. Each unit is manufactured to XRP's specifications for repeatable crimping and leak-free performance.

This 50-inch brake hose is ideal for builders and technicians fabricating custom or modified brake systems where OEM hoses do not fit the layout. The AN4 straight female-to-female configuration allows for straightforward connection to AN4 male fittings (adapters, proportioning valves, master cylinders, or calipers). Applications include trail-rated off-road rigs, vintage vehicle restorations, competition race cars, and custom fabrication projects where hose routing requires a specific length and geometry. Technicians and serious enthusiasts select XRP hoses for their consistency and proven performance in demanding thermal and pressure environments.