Replace both front brake lines when you do the rotors. Cheap insurance. As they age, they collapse and don't release the caliper properly, causing break 'drag' and warping.
In addition, we're under-braked to begin with. Wheel lug torque is critical. Clean all 10 front lug studs with a wire toothbrush, run the lugs in and out a couple times, and repeat. Then apply a drop or two of oil to the outer thread or two, then clean the face of the rotor hat and the inside face of the wheel. Install the wheel, and stage-torque. First to 75ft/lbs in a star pattern (every other), then to the final torque of 100.
If you value your rotors, you'll follow these steps.