Brake Line
A system of metal tubes and flexible hoses that carry pressurized brake fluid from the master cylinder to the brake calipers at each wheel.
Brake lines are the conduits of a vehicle's hydraulic braking system. When you press the brake pedal, the master cylinder pressurizes brake fluid and sends it through a network of rigid steel tubing and flexible rubber hoses to the brake calipers or wheel cylinders at each wheel, clamping the brakes.
Brake lines are divided into two parts: steel lines, which run along the vehicle chassis where there is no movement; and flexible rubber brake hoses, which connect the steel lines to the calipers, allowing the wheels to move up and down with the suspension and pivot for steering. High-performance vehicles sometimes use braided stainless steel hoses for firmer pedal response.
Brake lines operate under extreme hydraulic pressure and are exposed to harsh road elements. In older vehicles, steel brake lines can rust and corrode, particularly in areas where road salt is used, leading to leaks. Flexible hoses can dry rot, crack, or swell internally, restricting fluid flow and causing the brakes to drag or pull to one side.
A leaking brake line is a catastrophic safety issue, as it will cause a sudden loss of brake pressure and stopping power. Replacing damaged brake lines and bleeding the brake system is critical to restoring vehicle safety.