The student was conducting a series of circuits with touch and go landings. Wind conditions were calm and during the fifth circuit the pilot decided to carry out a full-stop landing before using another runway. At a speed of about 30 knots during the landing roll the pilot applied braking, but the aircraft immediately veered sharply to the right and ran off the side of the runway. The nosegear was broken when the aircraft entered a ditch before coming to a halt. An excessively worn brake pad on the right wheel assembly probably caused the brake to grab. The pilot had been unable to correct the resulting sudden and unexpected swing in time to prevent the aircraft running off the side of the runway.
