My 99 Rodeo has a similar vibration, actually a shuddering, during braking. No awful noise, but it feels like a warped rotor, i.e. the brake action pulses with each wheel rotation even though there is constant pedal pressure. I replaced pads, rotors, and bearings and the problem is still there, no change. I assume it's not something the ABS is doing because my ABS dash light is on, and I assume that means the entire ABS system is disabled. The shuddering was there even before my ABS light came on anyway.Any ideas on what else might cause this? I've considered alignment, unbalanced wheels, old brake fluid?