How do you replace discs on Mazda 3?

To replace the brake discs on a Mazda 3, start by lifting the vehicle and removing the wheel. Next, detach the brake caliper by unscrewing the bolts and slide it off the disc; support it with a bungee cord or wire to avoid stress on the brake line. Remove the old disc by unscrewing any retaining screws and sliding it off the hub, then install the new disc and reassemble the caliper and wheel. Finally, pump the brake pedal to ensure proper function before lowering the vehicle.