I need some new brakes on 1997 300ex. My fronts are real bad and I can tell my backs are getting there. Is it hard to change the brakes? Is there anyplace I can look online that can walk me thru the process? How long should it take? I know all of the brake pads are the same for the 300, so I will go and get those monday. Let me know if anyone can help me out...thanks!!