I cannot see how to post so I will ask my question through you. Sorry for doing it this way!
My brakes go from having the assisted help to all the way to the floor, manual "some brakes". They will return at their own time. It is not from driving too far as it happened the last time on a 15 mile trip over basically smooth roads. It is not as if the brake fluid is getting heated up.
I had it in a shop to check the "boosters" - there are two on my 1997 National Dolphin 454 Chevy engine. It is scary as I like to travel in the mountains and have lost the brakes. Even after sitting overnight, they are still non-working.
