Shaking brakes 1999 dodge ram 1500, the truck shakes when applying the brakes even stroger if you do it from higher speeds

Your rotors are warped. You also probably need to brake pads. Take your rotors off and inspect them for cuts and grooves. If the surface is not flat you'll need new ones. If not take them to a machine shop and have them turned. Turning your rotors will cut them down until the surface is perfectly flat and not warped. The shaking is cause when the rotors are warped and you press the brakes and the rotor applies more pressure where it's high and less where it's low, thus causes it to shake

Replace the rotors and pads. these rotors rust from the inside out, they will not be able to be turned as the rust is from thr inside. Napa premium rotors now come painted on the inside of the rotors they seem to hold up pretty good . i Dont know why you would not be able to paint your replacement rotors just keep the paint off of the pad surfaces