So, the brakes on my 91 z get VERY touchy sometimes, but the only time they do this s when the car has been Sitting in moisure (Raining or snow). It doesn't do this when the car is moving and it's raining, it's only if the car is sitting while it rains. They stop being touchy after I drive around on them a little. Other than that, the brakes are fantastic, stops without issue.

That's because the surface of the rotors get a little oxidized whenever left sitting, especially in moist conditions, after a a little bit of driving they clear up.

May Also Occur If You Wash Your Car And Then Not Drive It For A Few Days,The Rotors Will Start To Rust Over.