Intermittent noise from front when braking
 

Just what the title says. Brake pads have plenty of meat left and have no damage - wear indicators are far from touching the rotors. Caliper moves freely on slide pins and piston also moves freely. Rotors are also good. No air in the lines and fluid level is good. Only seems to happen about every other time when braking.

Do the brake pads slide in and out of the caliper bracket easily?

Yes. Nothing is binding or sticking. Everything moves freely.