For the reduced barrier ac hose, it refers to the thin wall ac hose. It means the outer layer of ac hose is thin compared to standard barrier hose.

Another reason for the power steering hose blowing off could be due to high pressure within the power steering system. If there is a blockage or restriction in the system, it can cause pressure to build up, putting strain on the hose and causing it to detach. It is important to have your power steering system inspected regularly to ensure that it is functioning properly and that there are no blockages or restrictions.