Most likely has to do with either needing new
brakes, or an ABS harness. If the ABS is not working
properly the brake pedal will "kick back" at you,
similar to what happens when you slam on the
brakes in the snow. The harness runs from the back
of the wheel bearing. If you can pull of the front
wheels and look behind the brakes. You should see
wires running out from the back towards the front of
the car leading up to the motor. Check these wires
from breaks. GM has a poor design for these
harnesses and they rub on the lower control arm.
Not terribly expensive to fix on your own, simply clip
the wires and use butt connectors to attach the new
harness, plenty of YouTube vids to help, also check
your brakes while your at it.
3 people found this helpful.