1995 Chevy Silverado rear brakes

I'm not sure I understand. When you hit the brakes, the tires spin or skid?

I come to a complete stop but the back tires keep spinning and try to push the car forward only when I'm stopped on the snow or ice.

[quote:2cfa7a94b6="Jacobandnickolas"]I'm not sure I understand. When you hit the brakes, the tires spin or skid?[/quote:2cfa7a94b6] I come to a complete stop but the back tires keep spinning and try to push the truck forward only when I'm stopped on the snow or ice. is this the adjusting screw ????????