Do I need to replace the brake rotor and pads when installing this hub?

Not necessarily. The hub itself is separate from brake components. Inspect your rotors and pads during installation and replace them only if worn or damaged.

What fasteners do I need to bolt this on?

Hardware is not included with the assembly. Check your vehicle's service manual for the correct bolt specifications and torque specs for your application.

Can I reuse the old wheel speed sensor from my original hub?

Compatibility depends on sensor type and condition. Most newer hubs use magnetic or inductive sensors that are similar, but test-fit your old sensor before assuming it will work with the new unit.