I have been experiencing this problem mainly in the winter on my 1997 Tacoma 4x4 auto transmission, 90,000 miles. When it's freezing or below, every time I come to a stop the rear drive wheel on the passengers side will lock up. If I was on snow or ice the truck would go into a skid I could not get out of. If I take my foot off gas with truck in drive it would not roll forward/wheel still locked. Usually when I stepped hard on the gas there was a loud thump/bang sound and the wheel would release and the truck would go forward. If I shifted into reverse or neutral for a split second and quickly put it back in drive without stepping on the brake, there as no thump/bang sound and the truck would roll forward as normal. In the warmer weather when I stopped, the wheel would not fully lock up, but it would feel like the brake was slightly engaged or sticking; and if I took my foot off the gas sometimes the truck would roll forward and other times you could feel the drag. The problem is worse if you depress the brake harder or quickly.