120k miles Yukon generally in good shape. It had a brake job done recently on both the pads and the drum. Automatic transmission. On very sharp turns the rear left wheel is locking into place and skidding along the road. The braking is extreme enough that the car lurches from 10-15 miles and hour down to zero suddenly.

Welcome to AF, so has anyone taken the suspect wheel/brake apart to see what may be happening?