Like Alex said, the rubber is fine. Just check your worm clamps every once in a while. The rubber under neath the braided lines is fare better than the lines in these kits, and are rated at a higher psi not to mention different fluids. Pushon style hose is a nice and easy hose to work with, but the fittings are more expensive than the braided, but you don't cut yourself like with braided.
