A slight drag is normal and left and right should match. If drag is more than normal or not equal from side to side, replacing the calipers should correct that.
The brake pads might not be adjusted properly. The brake pads can be too tight and have contact with the rotors.
Remove the wheel; remove the brake pads and caliper; the rotor should slide off of the lug bolts.
Warped rotors or sticking caliber.
Aggressive driving.
According to customer reviews the best brake pads and rotors are EBC brake rotors and pads. They are manufactured in Britain and can be found at any auto store including Canadian Tire in Canada.
pads
Brake calipers are the hydraulic devices that wrap around the rotors and pinch the brake pads into the rotors when you stop.
Some as the pads and rotors break in but it shouldn't be excessive.
Possible wrong rotors???
You do not need a torque wrench when replacing brake pads and rotors. Some of the tools needed to change the rotors and pads are the c-clamp, sockets, wrench, grease, and brake cleaner.
no
When rotors need to be changed usually the pads have worn down. It is always a good idea to change pads when changing rotors.