Due to warped front brake rotors or variations in the thickness of the rotors, brake pulsations may develop. The best method to reduce pulsations is to use an "On the Car" brake lathe (as long as the rotors are suitable for turning). "On the Car" equipment can correct variations (or "runout") in the rotor surfaces because it also corrects variations in other components (e.g. the hub).
Car Problem Reports
Jeep Wrangler Brake pulsations due to warped front brake rotors
Jeep Wrangler Problem
Visitor, 2005 Jeep Wrangler, 65,000 mi
I can feel a pulsation in the brake pedal when braking lightly. I assume one or more brake rotors are warped.