ok... been having this problem for a while, only happens when its cold. brakes are manual for a couple minutes in the morning or if its cold out then i get the power back. its getting colder out now and its doing it more and more, so its going to have to get fixed soon...
1990 suzuki sidekick, 2dr, 1.6 8V stock brakes. been thinking maybe its a bit of water in the brake fluid and its freezing in the line?