I think I have that feeling too.
When I come to a stop it feels like the car bunches up (the driveshaft does compress) - and when I let off the brake it's like a little "chunck" noise and the tension is released. I hope it's nothing major, I thought it was the front brakes grabbing more than the rear. For now, I keep all those nipples greased along the driveshaft and u-joints.