I've got a 94 cavalier with sometimes the right rear brake locks up at slow speed when braking.

ok not sure about the snd generations but mine was doing the same thing a few weeks ago. id check your adjustment on the hub. theres a little spring you turn to raise and lower where the pads set.

i had mine too close to the hub and it caught faster then the other 3 tires did. adjust it down some and youll be fine.