| 303 / | HD | FLUID-PRESSURE AND ANALOGOUS BRAKE SYSTEMS |
| 121 | DF | SPEED-CONTROLLED {44} |
| 122 | DF | .~ With failure responsive means {8} |
| 122.09 | ![]() | .~.~ Pressure failure {5} |
| 122.1 | DF | .~.~.~> With warning |
| 122.11 | DF | .~.~.~> Detected via stroke sensor |
| 122.12 | DF | .~.~.~> Pump failure detection |
| 122.13 | DF | .~.~.~> Auxiliary pressure failure {1} |
| 122.15 | DF | .~.~.~> Pneumatic |