'out of round'/warped/pulsating brakes on typically blamed on a 'warped' rotor. Definition of warped is 'to become bent or twisted out of shape'. I have yet to encounter a warped rotor. Every rotor that was supposedly warped I would put on a large bearing and spin it to watch its' 'trueness'. None ever seen to be warped. The pulsating is caused by heat. The applying of brakes is the friction between the pads and rotor. The energy of the moving car is converted to heat at the pads and rotors. A hard stop will create more than normal heat and if a hot spot of the rotors' surface is created,that hot spot will become heat treated/ carburized. That carburized area/spot ( even though it's only on the molecular surface) will have a different coefficient of friction compared to the other areas thus creating a pulsing. Turning the rotor(s) by only a few thousands will remove the spots but because of a drivers' braking characteristics,they'll soon re-appear. If you got 137K on your brakes,you've been very good/exceptional in your brake applying pattern.