Not always true. Most pulsing is due to material transfer from the pads onto the rotors. The binders in the pads break down and can cause a uneven distribution of material on the rotors. Causes the grip-slip feel.If you're getting pulsing you should pull, clean, and re-lube all caliper slider pins.
I'll bet one is sticking.
There are lots of good posts on this as well as a technique to Renew the rotors to potentially fix it.
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