15in #4 Line -4 Str/-4 Str 5pk

The 15in #4 Line -4 Str/-4 Str 5pk is a professional-grade braided stainless steel brake hose assembly designed for custom hydraulic brake systems in performance vehicles, hot rods, and modified trucks. As a mechanic, you know that factory rubber brake lines degrade under heat cycles, flex excessively under hard braking, and can rupture during aggressive track use or high-performance modifications. This five-pack of straight-to-straight -4 AN fittings provides the reliability and consistency needed when upgrading brake systems on classics, restorations, or race-prepped platforms where stock lines won't cut it.

Each 15-inch line features PTFE (polytetrafluoroethylene) internal lining that resists fluid degradation, eliminates moisture absorption, and maintains consistent brake pressure response across temperature extremes—critical when running synthetic DOT 4 or 5.1 fluids in modified systems. The braided stainless steel outer jacket provides crushing resistance, abrasion protection, and superior flex durability compared to rubber alternatives, while the -4 AN straight female fittings on both ends deliver reliable 37-degree flare seals that resist vibration loosening during sustained acceleration or braking events. The compact 15-inch length makes these ideal for short runs, proportioning block connections, or tight engine bay layouts where longer hoses would need routing adjustments.

Technicians upgrading dual-reservoir master cylinders, installing remote proportioning valves, or building custom brake bias systems will appreciate the five-pack configuration—enough for a complete system rebuild without excess inventory. These hoses work with any -4 AN compatible component, from OEM-style master cylinders to aftermarket balance bars and adjustable proportioning blocks. Installation is straightforward: hand-tighten fittings, then use a wrench on the fitting body while turning the hose gently to ensure proper seating without cross-threading. Keep these on the shelf for brake system maintenance, emergency repairs, or as spare stock for customer builds.