Is it normal for these cars that you have no power brakes right after WOT? It came like this when I bought it and I've replaced this connection once in the past. I suppose it's a check-valve, but that didn't change anything: I know there is no vacuum at WOT, so in that regard I figured it was just an old car feature. And a second after the power returns. But, none of my modern car have this phenomenon, so perhaps it's not normal?