Do I need new axle nuts or any fasteners to install these?

Fastener specs vary by axle configuration. Check your service manual for torque specs and hardware requirements before install — you may reuse existing hardware if it's in good condition, or swap in new OEM parts.

Will these work with my factory ABS system?

Yes. These are ABS-compatible and designed to integrate with factory anti-lock brake systems without modification or sensor work.

How do I know if my bearings actually need replacement?

Listen for grinding or humming that changes with turning, or feel for play in the wheel when it's lifted. Rock the tire side-to-side and up-and-down — excessive movement means the bearing is worn. If you hear noise or feel vibration under braking, bearings are likely the culprit.