I just replaced the bomb in my 1990 90Q 20V, flushed the hydralic fluid and re-filled with Pentosin 11. Now when the car is first started and the temperature is fairly cool (~50 degreed F), I get a noticeable groaning sound especially when turning the wheel. After a few minutes, the sound seems to go away. It did not do this before I replaced the bomb. Any ideas?? TIA Peter (ptracy@ekbos.com)