I have a 2001 f150 that I cannot get the brakes to quit pulsating. I have replaced the rotors, calipers, flexible brake lines, bearings, brake pads, etc. several times. I replace these parts and it works for a very short period of time and then it starts pulsating again in a very short period of time. I am not pulling a trailer, I have not had any heavy braking and then run through water to rapidly cool and warp the rotors, etc. I have been asked all those questions. When I take the rotors off and bring them in to get them turned they are out of round every time. I have bought the highest quality rotors I can find and still have the same results. I have a couple of friends with the same truck and they are having the same problem.

 

Welcome to the site, spend some time browsing around the site you will learn much about your truck. Use the search feature to find specific responses to questions you may have, odds are someone has had the problem before and it has been answered already.
Example would be in the search box I put pulsating brakes this is what I got.
https://www.f150online.com/forums/se...archid=4030479
4 pages of answers that may help you.

 

The main reason for warped rotors is uneven torque of the lug nuts. If you are not hand torquing the lug nuts, start doing so. For your truck, the proper torque is 150 ft lbs.