[NYBo]

Did the shop attempt to adjust the brakes? There is a "star" adjuster that is used to help adjust the brakes by tightening or loosening the cable. In theory they are suppose to self adjust - usually when backing up and when the brakes are applied to stop it should "click" (though you won't hear this).

The rear brakes in this generation minivan are adjusted by using the the parking brake. Stopping in reverse has no effect on the adjustment.