Thnx
The 90 had a bad blinker I needed to fix one day a kid pulled out in front of the truck young driver did not notice I was not slowing down going downhill car pulls in front I was standing on the brake pedal!
Evidently I did all the brake work on that truck properly everything worked but that was close.
I fixed the blinker after that, next day walked by truck L rear tyre English retread had delaminated!, drums in rear.
So yes why I was asking this is for 110 thinking the balance valve is there for a reason.