Pulsing is a side effect of ABS. Since your ABS light came on, it's a safe assumption that your ABS is the cause of your pulsing. There is an easy way to find out. Jack up each corner of the vehicle, and with the vehicle in neutral (use wheel chocks and extra safety awareness) slowly spin each wheel by hand while a friend slowly applies the brakes. If they friction comes on smoothly, the rotors are good. If the friction comes on erratically, you have warped rotors.
Since your ABS light came on that needs looking into also. I'm only suggesting a way to determine if you also have warped rotors.