Triumph TR3: the first British car with disc brakes (1955-1962) The Triumph TR3 was the rugged side-screen sports car that made Triumph's name in America, and in 1956 it became the first British series-production car fitted with front disc brakes. A guide to telling the TR3, TR3A and TR3B apart, what they are like to own, what to check when buying, and what they are worth.
