Does this come with new ball joints or are they pre-installed?

Ball joints are integrated into this loaded assembly—they're not serviceable separately. You're getting the complete knuckle as one unit, ready to install.

Will this work with my existing brake rotor and caliper?

This is an OEM knuckle, so it uses factory brake compatibility. Your existing rotor will mount to the integrated hub without modification.

What hand tools do I need to install this?

Standard suspension work—socket set, breaker bar, and a ball joint separator. Wheel removal and basic jack setup required. Torque specs are in your vehicle's service manual.