So my car’s not broken, but I’ve noticed that when I start it after it’s been sitting for more than a few hours (I’d say around 6-8) there’s a mechanical screeching noise for about 20 sec, then it goes away. When I shut the car off I get the same sound very briefly, but it sounds like it’s slowing down now, think a turbine shedding speed. The only thing I can think of is the ABC pump presurising the system, and the forums/Google has been useless. It’s not surper loud, about exhaust level when I start it in my garage, inaudible outdoors, and very loud in the echo chamber of a parking garage. Any ideas ?