Applies to: Model 930 with code BA1 (Voith retarder, performance optimised) Model 930 with code BA9 (Voith secondary retarder R 115) Model 930 with code GK8 (Turbo clutch) Model 932 with code BA1 (Voith retarder, performance optimised) Model 932 with code BA9 (Voith secondary retarder R 115) Model 932 with code GK8 (Turbo clutch) Model 933 with code BA1 (Voith retarder, performance optimised) Model 933 with code BA9 (Voith secondary retarder R 115) Model 933 with code GK8 (Turbo clutch) Model 934 with code BA1 (Voith retarder, performance optimised) Model 934 with code BA9 (Voith secondary retarder R 115) Model 934 with code GK8 (Turbo clutch)