Hand brake

I have a handbrake that will not hold. Ive had it looked at by two different individuals. Im told “all adjustment is out of cable parking brake lever on caliper is not moving caliper piston to engage pads against rotors both calipers need replaced” the cost is about $250 each. Is this rational?

I read several Solstice forums concerning this parking brake problem. It seems the parking brake can be adjusted at both the parking brake handle and the rear brake pistons. I would try a good independent shop with a proper repair manual before I would buy new calipers. A special tool is needed to adjust the brake pistons though.