PC Br155 Brake Input Values Not Shown In The Hud

For the BR155, when I apply the train brakes, the brake input values are not shown in the Speedometer HUD.
The output values are shown though. The image shows the HUD when the train brake is minimally applied. I also noticed the brake cylinder value is decreasing and falls back to zero.

It is not a big deal, but very sloppy.