As long as your rotors are not warped, or you have not let the brake pads wear to the point they defaced the rotors, there is no need to change them. Just install new brake pads. Rotors can last the life of the car.
Rear rotors should last 100,000 miles easily!! change your brake shoes at around 45-50,000 miles
How many miles should I have before I change my spark plugs
at how many miles is it before you change your timing belt
every 72000 miles
If you drive normally and use full synthetic you should change your oil every 8,000 miles. You should change the filter at the same time and change your air filter every 30,000 miles.
40,000
possibly warped rotors.Feels for grooves on the rotors(when rotors are cool,your rotors should be smooth ) if you feel them you need to replace them,and dont forget to replace your pads too.Worn pads grind your rotors and ruin them.
if the car is running rough or if plugs are in poor condition
All timing belts should be changed before 100,000 Miles
3000 miles on oil and filter, Then change
Every 60000 miles you must to change it
Change it every 60,000 miles.