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Brake pulsation is always a warped rotor (or drum in some cases). If it has happened just after someone doing a brake job or tire rotation, it is quite possible that they did not use a torque wrench to tighten the lug nuts properly, and put them on with an impact wrench. Other common things that can cause this problem would be rust scale or something else stuck between the rotor and the rim when bolted in. This foreign matter will cause the rotor to sit a little crooked and cause that sensation.
Finally, if you have brand new rotors and have not "seasoned" them properly, you can warp them in a matter of minutes-believe me, I know!
You shouldn't drive your vehicle with new rotors for any extended periods at a high rate of speed. The rotors are very rough and the pads are trying to "seat" themselves into that rotor. While it is doing this (usually the first 200 miles), the heat buildup on a rotor will be extremely high, sometimes enough to glow red from the friction.
You should also avoid running into water on a dry day, the cooling effect of the water can cause warpage instantly. You should also avoid hard stops in that first 200 miles.
I warped a brand new set of power slots on my Durango a few years back by driving it on the highway from the shop that installed them. It was only 20 miles home, but the 70+mph (and the offramp braking too) was enough to heat a spot on them and cause a noticeable "bump" from the brake pedal. Ended up having them turned 2 months later, taking it real easy for 250 miles, and haven't had the pulsation back since.
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