Reply to "Please help me identify (and understand how to operate) the aftermarket parking brake in my Pantera."

I'll tell you exactly why the line-lock was installed. 20 or 30 years ago, there was no readily available parking brake caliper kit to use if you installed larger than stock rear rotors. Unless you were a machinist, you had two choices: either have the bracket modified that mounts the OEM rear caliper, and use it (the OEM caliper) as a parking brake only, or install a hydraulic line-lock. If you used the OEM caliper you were adding a ton of unsprung weight whereas the line-lock added zero. Some people hated the idea of a line-lock but others just couldn't bring themselves to hang all that extra weight where the Pantera needs it the least. Some people were quite happy with them. Gary Hall had line-locks on all of his Super Panteras. I can remember being faced with the same dilemma, in fact, I bought a line-lock at one point. The idea of it bothered me so much that I returned it before I even had it out of the box!