Q&A

 Master

I would remove all four wheels and inspect the brake linings for contamination/oil/grease. Visually inspect the lining materials for any abnormalities. If the Anti Lock Brakes are working correctly the brakes once they lock up will catch and release to maintain control of the vehicle. Perhaps find a parking lot that you can do a "panic stop" in and you will feel and hear the pedal pulsate if the ABS is working correctly.