Smokey, according to the original post, the aircraft taxied to the "holding point" at which it came to a stop shuddering...I would think this is indeed do to the hot brakes, and not modulating brake pressure to avoid lock.
I've flown the 320 with the Carbon Brakes, and the NG with the steel, and can say that the steel brakes on the Boeing definitely will shudder at even relatively low speeds when brake pressure is applied after they've been heated up.