71-91 GM Rear Stainless Brake Line

The 71-91 GM Rear Stainless Brake Line from Rough Country is engineered for lifted full-size GM trucks and SUVs that require extended brake line routing to accommodate suspension upgrades. When you lift a vehicle by 4 to 6 inches, the rear axle rises away from the chassis, creating slack in the factory brake lines and introducing dangerous flex points. This rear stainless brake line compensates for that geometry change, maintaining proper line tension and brake feel while preventing stress fractures that lead to brake failure or fluid leaks.

Built from braided stainless steel construction with PTFE (polytetrafluoroethylene) inner lining, this brake line delivers superior durability and corrosion resistance compared to rubber hoses exposed to road salt and moisture. The PTFE core reduces swelling and maintains consistent fluid flow under pressure, critical for reliable brake modulation on lifted vehicles where rear suspension geometry is already compromised. DOT approval ensures this line meets federal safety standards for brake system components, and the stainless braiding provides abrasion protection against frame contact and vibration fatigue that shorten the service life of standard hoses.

Mechanics and off-road enthusiasts upgrading 1971–1991 GM full-size trucks and Suburbans with 4- to 6-inch lift kits should prioritize this rear line as part of a complete brake system refresh. Installation is straightforward: disconnect the factory line, route the new stainless line along the frame rails to match the new axle height, and reconnect at both chassis and axle-mounted fittings. Sold individually, you may need one per vehicle depending on your lift configuration and brake system layout, making it essential to verify fitment with your specific model year and suspension package before ordering.