The <<controlOperator>> action ':Enable on Brake Pressure > 0' does not show an output Pin corresponding to an output Parameter of type ControlValue that must exist for the Behavior Enable on Brake Pressure > 0. From SysML1.0:

'11.3.2.2 ControlOperator

,,

Constraints
[1] When the «controlOperator» stereotype is applied, the behavior or operation must have at least one parameter typed by ControlValue. If the stereotype is not applied, the behavior or operation may not have any parameter typed by ControlValue.'

It would make sense (and be clearer) if the «controlOperator» had an output Pin typed by ControlValue.

Below we see the diagram adapted to use an output Pin typed by ControlValue.