Should you replace brake pads and rotors together? The short answer is probably, assuming you can afford to do so. While brake rotors do not usually wear away, they often become damaged from use. Brake pads can leave a deposit of superheated pad material on the surface of the brake rotors during hard use. These deposits will make the rotors feel as if they're bent or warped during normal braking, causing the steering wheel to wobble. While it's true that brake rotors can be reground to remove the deposits, the cost of grinding a brake rotor smooth is nearly as high as the the cost of replacing the rotor (often, the cost of grinding a rotor is higher). What's more, griding the rotor doesn't always fix the problem.
If your vehicle's brake rotors are in pristine condition, with no noticeable steering wobble or grinding noises under braking, odds are your rotors are OK. But if you've noticed noises or wobble - or if your rotors have become rusted and corroded - it's smart to replace them when you replace your brake pads.
And if you buy pads and rotors together as part of a brake kit, you can make sure the pads and rotors compliment one another. All of the brake brands we offer carefully pair up rotors with pads, maximizing both performance and durability. Many people report big improvements in brake performance after replacing both rotors and pads with a purpose-built kit (like the kits we offer).