2007 buick terraza. stability system/traction control/abs causes front brakes to engage without warning. this has occurred no less that 25 times. speed at time of incident has been from 10 to 55 mph. ratcheting sound occurs (same as when traction control applies in slippery conditions); front tips down as left brake applies; vehicle pulls hard to the left. the only way i can drive is to pull the fuse, leaving abs, tc, and ss off. dealer has tried to fix, gm customer service became involved briefly, but i still drive without major safety features, or take my chances on abrupt speed changes, and lane changes. not something i enjoy on the dan ryan in chicago, when the flow of traffic is above speed limit and chicago drivers use 5 feet as a following distance. i have found from the internet that other gm cars have had this same problem. i cannot believe that gm has never investigated this. i really like the car, but random braking surprises are disturbing. *tr