My 1991 LS 400 with about 265,000 miles has recently been acting funny. I have lost brake pressure while having 75% or better of the brake pads in the front. I feel like the pedal is almost going to the floor and I am getting very little stopping power compared to how sensitive and powerful the brakes used to be. What could be the cause? Any and all help is very much appreciated.
Note: I have also added brake fluid once during this time period because it was low.