His greatest achievement in F1 was taking victory for BRM in the 1959 Dutch Grand Prix at Zandvoort, when the notoriously unreliable car worked well for once (Dan Gurney and Hans Herrmann had bad crashes after brake failures). He also won the 1960 German Grand Prix with a Porsche 718, a race held for Formula Two in preparation for the rule change of 1961. Bonnier was one of the driving forces behind the Grand Prix Drivers' Association.