What car is this you are talking about first of all?

It could be that your brake master cylinder is leaking brake fluid past its seal and letting it into your brake booster. This is what happened to me... I changed the master cylinder but the brake booster was damaged and puts out minimal assist... buit the car stops very well regardless... much better than your typical modern econocar. Econocars I have noticed though, overboost the hell out of the brakes and make them very touchy and this tends to give these drivers a lot of false confidence... what it translates into is you're going on the freeway and someone ahead of you touches their brakes, so you give yours a little nudge and lock your wheels up and go over the side of the road...almost lost control of my dad's 2000 Accord this way. Anways im getting off the subject here.

You might want to take your MC off and check it out if it hasnt been replaced... if youi change it out do the four rubber hoses as well... one per brake caliper. You should be able to stop from 40 mph to 0 mph with very little brake pedal pressure, and should be able to lock them up if you give them a good stomp. Not that locking up your brakes is a good thing for your pads or stopping distance, but it is a good guage of performance.

__________________
1985 CA 300D Turbo , 213K mi