I have a similar problem with Venus, my 67 C10.
I have no e-brake pedal in the cab.
I haven't had time since getting her back from the shop to see what else is missing.
I'll hafta to look at that as well.
The e-brake issue is not that important to me at present, but I definitely want it fixed. This is something that I "might" be able to fix myself.
Need to find the parts first.
Need gauges "first" though.
I'll keep watching this post.
Davey