Replaced the pump to solve a no PS at idle problem, it fixed that but the new pump (A1 Cardone reman)is very noisy. I've never heard a louder one. I have flushed it, bled it per factory service manual, also bled it with vaccuum applied. No foam, works great, just loud. The odd thing is upon first start up it was very quiet, ran it a couple minutes to check for leaks, shut it off and cleaned up. The next time I started it and ever since it has been loud. Any ideas. 97 Suburban, 454, with hydro-boost power brakes. I also changed three hoses 2 pressure and one return.