Do I need to replace the brake pads when I install this?

The knuckle comes brake-ready with mounting surfaces and caliper ears intact, but brake pads are a separate wear item. Inspect your existing pads during install and replace them if they're worn past the minimum thickness.

What tools will I need to swap this out?

You'll need a jack, jack stands, basic hand tools (wrenches, sockets), and a wheel removal tool. The assembly bolts to factory points, but you may need a ball joint separator if your tie rod end is stubborn. A service manual for your model is highly recommended.

Can I reuse my old wheel bearing, or is it new?

This assembly comes with the bearing already installed and ready to go. You're not reusing anything—the old bearing stays with the old knuckle.