Brakes on 2004 Toyota Tacoma

my brakes have always pulsate, I have replaced them two times and at certain speed, it just pulsates very hard. what could be the reason and how to fix it?

Asked by for the 2004 Toyota Tacoma
I have a question for you! Do you feel the pulsation more heavily in the steering wheel or brake pedal, or do you feel it through the seat? If you are feeling it through the seat, that would be your rear brakes that need service. If you have serviced the front brakes twice, and feel it in the seat, you need to service the rear brakes.

If you feel it in the steering wheel or brake pedal that is from the front brakes. Did you have your front rotors machined when you replaced the brake pads? Brake pads themselves do not cause the pulsation. The pulsation usually comes from warped rotors. You should always have your rotors "turned" or machined on a brake lathe when you replace pads. If you are doing the work yourself, you can go to O'Reilly's or a similar part store to have them machine your rotors.
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I had the same problem, and after taking it in to the shop it turns out I needed to get my front rotors replaced (the pulsating was mostly in the steering wheel).