I have a 1994 Thor Pinnacle 34â€™ P30 chassis 454 ci 4wheel disc brakes VIN1GBKP37N7R3306779. My PS pump growled loudly all the time for about 2 months and now I lose ALL assist on brakes and steering. Also, ps fluid does not leak anyplace but runs over the top of the reservoir when I shut it off. I pulled the pressure control valve out and found no trash but very scored. When I replaced it things worked for a few minutes. Everyone I have talked recommends new factory parts but Delco dealers donâ€™t list a PS pump nor do GM dealers. Delco rebuilts do not have a pressure relief valve, which is most of the problem. Now what?