Brake Disc Caliper problems of the 1998 Toyota T100

Calipers on the brakes of Toyota T100 pickup trucks lockup causing irrepairable damage to brake pads and rotors. This necessitates replacement of the brake assembly and rotor-hub parts and significant labor cost ($931). This has happened twice in less than 18 months on my 1998 T100. When I prompted the dealership to pay for materials the second time, they told me it happens all the time with T100, tundra and tacomas. They said there was nothing I could do to prevent or aviod the situation and they will not absorb the material costs (approx $450) for the second repair because it was a "mechanical failure" of the calipers. When I suggested to them the fact its a known issue among Toyota dealership repair shops should make it a recall issue. It was their equipemnt, installed by them that was failing. My request for discount in the second repair was dismissed. I suspect the problem is continuing, based on an intermitten noise and hesitation in the front right of the truck now and again and excessive brake pad soot on the wheel rims. Toyota needs to address this situation and owners should not be expected to fork out $931 every year to maintain brakes. I am not looking forward to a third repair of this type.