Pedal pulsations are often caused by rotors that are not smooth or not the same size as the other wheels. Disc pads can cut into the rotors and make them uneven, and cause the brake pedal to grab at different places. Look at the car rotors (if you have alloy wheels) and see if you can see groves or wedges in them.
If your rotor is smooth, then they might have been machined wrong and they don't fit on your wheel evenly any more.
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If your rotor is smooth, then they might have been machined wrong and they don't fit on your wheel evenly any more.