One problem related to brake disc caliper has been reported for the 1997 Subaru Legacy. The most recently reported issues are listed below.
Right front brake has failed to operate properly on at least four occasions. The brakes have gotten very hot and could possibly cause a fire or cause the brakes to lock up. The dual piston design results in one piston doing most of the work so the other piston becomes stiff and does not release. We have had the brakes grab and become extremely hot to the point that we are now on our fourth set of calipers with just over 36,000 miles on the car. Our mechanic advises this problem is quite common on Subaru's for at least the 1996 through 1998 model years. We have had the brakes replaced three times but do not have the old parts available.