PC Peninsula Corridor Gp38-2 Dynamic Brakes

I cannot seem to get dynamic brakes to work in Peninsula. I know how the work - have been using them on SPG no problem. Waited the usual 10 secs in set up (even waited in idle for 10 so 20 in total). The needle moves to the yellow a tiny amount but if I apply more dynamic braking, nothing. No amps, no speed reduction.

Is it a known bug or am I missing something that's different on this variant of the loco?

 

It seems that this is an issue for most players.
An update wrecked the dynamic brakes on the EMD locos. The last update fixed the issue on the SPG versions but not the PC versions.

 

Ah ok, thanks for replying. Loco brakes it is then on downhills.

 

Just to add that this bug also persists on console, even on SPG as well as Peninsula Corridor.