21in #4 Line -4 Str/-4 90 Deg Tube Style

The 21in #4 Line -4 Str/-4 90 Deg Tube Style brake hose from Allstar Performance is a precision hydraulic assembly engineered for high-pressure brake systems found in tactical vehicles, law enforcement platforms, and military applications. Built to exacting AN (Army-Navy) standards, this 21-inch hose bridges critical brake line runs where stock configurations fall short, delivering reliable pressure transfer and consistent stopping power under field-duty demands. Whether retrofitting duty vehicles or upgrading aging brake infrastructure, this hose addresses the need for custom-length, high-reliability hydraulic solutions.

This assembly features a 4 AN straight female inlet coupled to a 4 AN 90-degree female outlet, allowing flexible routing through confined engine bays and complex under-vehicle installations common in tactical platforms. The braided stainless-steel exterior jacket provides abrasion resistance and durability in harsh environments, while the PTFE-lined interior ensures chemical compatibility and prevents swelling or degradation under extended hydraulic fluid exposure. The tube-style construction maintains consistent internal geometry, eliminating the hose collapse risk that compromises braking response during sustained operations or high-load scenarios typical in armor-equipped or duty-cycle applications.

Technicians and fleet mechanics managing law enforcement, armored, or military vehicle fleets will find this hose essential for custom brake system configurations where off-the-shelf lengths prove inadequate. The 4 AN port sizing accommodates medium-flow hydraulic systems common in truck-based tactical platforms and light-armor chassis, while the 90-degree elbow outlet simplifies tight-space installations behind firewalls or across suspension hard points. Proper torque application at all connection points—typically 15–22 foot-pounds for AN fittings—ensures leak-free performance and maintains system integrity under sustained braking loads. Weighing just 0.22 pounds, this compact assembly minimizes vehicle weight penalty while delivering the redundancy and responsiveness that field operations demand.