New to me 2008 avalanche LTZ 140k miles, First snow, pulling out of snow/ice covered level to slight slope driveway. less that 5 MPH touch brakes front locks while rear spins. If I was to head down our hill I would have slip all the way down the hill. Brakes were replaced 5 k miles ago. My tires are about 75% worn, putting new tires on in a couple of day's however I'm hesitant to drive on our snow covered roads. Any help and opinions is appreciated.