Unusually, Kling found his way into motorsport via his first job as a reception clerk at Daimler-Benz in the mid-1930s, competing in hillclimb and trials events in production machinery in his spare time.

During the Second World War he gained mechanical experience servicing Luftwaffe aircraft, and after the cessation of hostilities he resumed his motorsport involvement in a BMW 328.

Kling was instrumental in developing Mercedes' return to international competition in the early 1950s, and his win in the 1952 Carrera Panamericana road race, driving the then-experimental Mercedes-Benz 300SL was a defining point in assuring the Daimler-Benz management that motorsport had a place in Mercedes' future.

This promising start was not to last, and with the arrival of Stirling Moss at Mercedes in 1955 Kling was effectively demoted to third driver.

However, away from the World Championship, Kling took an impressive victory in the Berlin Grand Prix at AVUS, another high-speed circuit.