I have driven my 46 without the brakes, but it was from one shop to the other on the farm.
She never came out of first (unless I was backing up) and I only goosed it sparingly. My left foot never left the vicinity of the clutch.
I agree with Fumblin. I would trailer the old girl to the mechanic. If you don't have another truck (or a trailer) to tow it with, call for a wrecker from your friendly local towing company. Im my experience, they're not too expensive, and I have used them a couple times to get my jimmy into town when the little bastard quit on me.
[is glad to be rid of jimmy]
You could try towing a vehicle that HAS brakes behind the truck and use those brakes to stop you.
Do not do this unless you have someone who has done this before. It can be EXTREMELY bad news if you don't know what you're doing.
