I recently purchased a set of Brembo rear rotors for my 95 E320 wagon. I have had them on the car for 30 days, and I took the car into my indy to have the brake fluid flushed. He said I have the wrong rotors on the rear, they should be vented. The outside piston on each caliper is extended and not making contact on the outer edge of the pad. The inside piston is not making much contact. He indicated this was very dangerous. I contacted the supplier of the rotors and they insisted the rotors were correct. Who is correct?