Ok, sorry if I misunderstood.
Sometimes, you can have a rear rotor causing this problem and you might not necessarily feel it in the pedal. If the sound is coming from the rear, then that could explain it.
The other possibility is that you have a tire on the front that is worn unevenly, most likely from being on the rear of the vehicle too long, and then being rotated to the front. If this is the case, you might hear the noise a little bit as you are driving along, but hear it louder under braking because the vehicle transfers more weight onto the front tires.
If there is uneven wear on the tires, you may be able to feel it with your hand. The best way is to look at them while they are spinning on a wheel balancer or with the vehicle on a hoist.
It could also be a wheel bearing. These normally change pitch as you veer side to side when driving. sometimes the noise goes away when turning one direction and gets louder in the other, but not always. These can be identified by running the vehicle while supported on a hoist and feeling the front coil springs. If it's bad enough to hear while driving, it's bad enough to transmit vibration into the spring. They can also be listened to with a stethoscope or by using a long pry bar or breaker bar to listen to it by pressing it against the steering knuckle and your ear.
If it isn't brakes, it's pretty much got to be one of those.