Braking in new pads in front.

[blinkwatt]

Well after installing my new front pads I let my dad drive my car(with me in it). I told him to hit the brakes somewhat hard to see if there was a noticeable difference. The brakes became alot more stiff and not so mushy feeling. But when he hit the brakes really hard it sounding like there was a sound like something skidding in the middle of it hard braking. It was fine when he hit them light and really hard but it was in the middle of the really hard one it made the sound. Could it have been the ABS or did I somehow get air in the brake lines(Iam changing the fluid out this week and redoing the rear pads anyways) or could it have just been the new pads "breaking in"(they were only used very lighty for about 3 stops before he decided to hit them really hard). Other then that the brakes have been fine.