I installed new front calipers, rotors and pads. When applying the brakes grab with appropriate force for 3/4 of the rotation of the wheel and the other 1/4 rotation grabs really hard, likelihood the rotors are warped. You can feel this in the brake pedal. I have checked the rotors for true with a dial indicator and they are true. I also checked the calipers and both pistons seem to be engaging at the same time. Does anyone have any ideas as to why this is happening?