Just an FYI:
Two levers come with the optional Grove parking brake; one with the square hole aligned with the lever sides- use this one. The other has a square hole aligned as a diamond-do not use this one.
I used the correct one but still had an issue where the brakes were fully released only with the lever in the center position-not good. I had to "clock" the lever another 90 degrees on the shaft to get it to be ON at the aft position and OFF at the full forward position.
I don't believe all this was explained on the brief instructions that came with the brake valve.

Jim