Actually, I feel that at high speed, the brakes work fairly well; it is at low speed that I feel they do not bite enough. At high speeds, I cannot lock them, but I do hear the tires chirping, so any more power and I would lock them (which is not necessarily good). But at low speed, the Jeep rolls a bit too long, and I dont feel the brakes really grab enough. I may start with the master and booster and go from there, but I defenetly need to do SOMETHING... Although maybe Hydroboost is not a bad option either.
If the tires begin to chirp then you're locking them up. It doesn't really make sense that they would work well at high speeds and not a low. Do you mean, you apply the brakes at high speeds then continue to hold them to stop, but they won't bite once you slow down? If that's the case then that's brake fade.
BTW: stay away from brake pads that say long life or high mileage as they aren't going to work as well. Although, on the flip side, performance brakes tend not to last as long.