Pulsing of the brakes is often just pad build up on the rotors. A mild de-glazing usually solves that issue. On older rotors, we have had a couple of people discover that the rotors were no longer 'floating' on the pins, but had become solid. Some cleaning and lubing of the pins that the rotor floats on helped dramatically. You can usually tell by grabbing the rotor and seeing if it wiggles a little.
Years ago when I was wrenching on Miatas I had a customer that had been to the dealer several times complaining about noisy brakes and pulsing feeling in the pedal. The dealer would de-glaze her rotors and pads and send her off, only to have her come back a couple weeks later complaining about the same problem. Someone finally sent her to me. She told me her tale and my first question to her was: Did you used to drive a large, heavy car with really good power brakes? Her shocked response was "Yes!".
I then explained to her that her old habit of braking very lightly from a long ways out worked well on the heavy car with very light touch, power assist brakes. However, on the light Miata with less power assist, she was effectively dragging the brakes and building up heat, causing the pads and rotors to glaze, which then resulted in the noise and pulsing. I explained to her that because of this she needed to get in the habit of waiting a bit longer, then pressing harder on the brakes when coming to a stop.
She was dubious, but agreed to make an effort to change her braking habits and see for herself what happened. 2 months later she called to thank me and to say that she no longer had any noise or pulsing issues with her brakes and she was now comfortable stopping the car with the technique I had taught her. She was thrilled that someone actually took the time to tell her why the problem had been happening and teach her how to avoid it in the future.
