they feel fine, but when the brakes = are stabbed hard (like in a panic stop) the peddle goes to the bottom of the stroke = and you can feel it bottom in the master cylinder. I have replaced the = front and rear brake pads and shoes (drums turned) the master cylinder, the vacuum = check valve and rear wheel cylinders the system has been bled manually, but = still the problem persists. the only components left are the proportion valve and = brake vacuum booster. The VW mechanics I have talked to say that the = vacuum boosters almost never go bad but it seems to me that it is the strongest = suspect left. Before I spend the big bucks and the major operation of = taking apart the dash, I was wondering if anyone had encountered a similar problem or = had some mechanical/hydraulic advice.