Rear breaks

[sin`]

I need help with my rear brakes, they are grinding a little, what should I replace? The rotors are bad so I'm going to get new rotors and new pads. Should I replace the calipers and if so how do I do it. I don't know much about cars really but I have people that will help me (Family and friends)
are the rotors hard to replace? will the caliper pistons push back in or do they need to twist and push in?

thanx for your help

 

[Ryan]

The rear calipers 'twist' in. OEM pads and rotors are fine if the car is just a dd. Ensure you grease the caliper bolts as well. If the calipers operated fine previously, I'd keep'em.