I bought a 92 mustang lx about a week ago still learning about it i know it has a 5 lug swap and disc breaks all the way around. now here is my issue. when the car is off the brake peddle is firm an does move much. when its on and i try and use the breaks it goes right to the floor. does anyone have an idea what is is also if i were to replace the brake rotors and pads what would i look for 94-94 pads and rotors?