The pilot reported that after touchdown, and during the landing roll, he applied the brake to make the airplane turn to the right. The pilot stated that the right brake did not hold and the aircraft veered to the left. The pilot could not get the airplane to turn back to the right and seeing that the airplane was traveling toward a bank, he applied hard left brake and intentionally ground-looped the aircraft. During the ground loop maneuver, the right wing was substantially damaged.