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Brake lines are referred to the tubes and hoses that is connected to the master cylinders and brake calipers in a hydraulic brake system. The brake lines function is to deliver the pressurized brake fluid through the wheel end.

 The brake lines are made up of steel found under the floor plan and sometimes wrapped with electrical wire coverings in order to protect from foreign objects such as flying debris. The ends are flared with either a double flare or an ISO flare, which provide maximum protection against brake fluid leakages. A shot flexible hose or flex hose connect the steel brake lines to the wheel cylinders or brake calipers.