One problem related to brake disc caliper has been reported for the 1997 Chevrolet Astro. The most recently reported issues are listed below.
Vehicle developed a random pull while braking, particularly in rain or snow & slush. In the beginning it was only the first time you applied the brakes after you drove 2 or 3 miles then it happened on dry pavement. It happens only occasionally, but can be very severe, it nearly pulled me into the guide rail on one occasion. This started around 12000 miles and it now has 46000 miles on it. The dealer has replaced pads, turned rotors, aligned the front end twice, and ground the clearance on the calipers twice. At gm denied having more complaints about this but I have heard of other paople with the problem. I was called by the dealer the other day to bring it in again to lower the front end and another alignment. I recently took it on a trip in which my brother inlaw drove it and asked me "have you noticed this thing pulling?" my wife also drives it and has complained to me. This vehicle has a problem , and I suspect there are others! I had a 1992 Astro awd but never had the problem. A friend of mine traded her Astro awd off because it had a similar problem, but pulled to the left, into oncoming traffic. I 've been lucky so far, but it could easily cause an accident because on some of the severe incidents it has pulled me off the edge of the road.