15in #4 Line -4 Str/-4 45 Deg

The 15in #4 Line -4 Str/-4 45 Deg brake hose from Allstar Performance is a critical component for high-performance automotive brake systems where precision fluid routing and reliability are non-negotiable. Built for serious street and track applications, this stainless steel braided hose delivers the durability and flexibility needed in modern vehicle modifications where factory brake lines cannot handle upgraded calipers, master cylinders, or custom suspension geometry. Whether you're upgrading a classic muscle car, building a road-race platform, or installing larger braking components, this hose serves as the hydraulic bridge between your master cylinder and caliper assemblies.

Engineered with a PTFE (Teflon) inner liner and fully braided stainless steel outer sleeve, the 15in #4 Line offers superior corrosion resistance and abrasion protection compared to rubber brake lines, ensuring consistent brake feel and eliminating the expansion under high-pressure cycles that compromises stopping power. The -4 AN (5/16-inch) port sizing with straight female and 45-degree female fittings provides flexible routing around engine compartment obstacles, custom headers, and relocated components—critical when space is limited or lines must navigate tight passages. PTFE-lined construction prevents fluid degradation and maintains brake fluid integrity under sustained heat, a necessity in performance driving where brake temperatures routinely exceed 200°F. The compact 15-inch length paired with dual female fittings allows builders to daisy-chain multiple hoses or connect directly to remote mounted proportioning valves and bias bars.

This hose is ideal for builders upgrading to modern four-wheel disc brake systems, installing remote brake proportioning, or relocating master cylinders in tube-frame vehicles and race cars. The -4 AN port standard ensures compatibility with proportioning valves, distribution blocks, and modern brake component ecosystems where metric hard lines have been replaced by braided assemblies. Installation requires proper AN wrench sizes and careful routing away from engine heat, moving components, and sharp edges; secure with P-clamps at 12-inch intervals and verify clearance to suspension travel. Technicians appreciate Allstar's precision engineering and consistency—every hose is individually tested for burst pressure and leak integrity, making it a trusted choice for customers who demand reliability when lives depend on braking performance.