"HandBrake" property won't change from a script.
Changing "HandBrake" property of Remote Control block from a script doesn't take effect if the grid, which hosts said RC block, has no wheels.
// init RC with actual block reference
RC.HandBrake = true; // won't take effect if grid has no wheels
RC.SetValueBool("HandBrake", true); // this will take effect
This issue impacts scripts that translate HandBrake property state to the other RC blocks, most likely placed on subgrids which in turn has wheels.