I've finally got the brakes working besides the E-brake. I've adjusted it per the service manual by pulling it and letting the ratchet click into place. It doesn't ratchet any more and the E-brake still doesn't work. Is there some kind of adjuster underneath that I haven't spotted yet? I don't see anything in the service manual. Or is my cable just too stretched out and it's time for a new one? The car had it's E-brake on for a good year or two while the car was sitting before I bought it.

there's a single linkage going from the e-brake handle back to a saddle that the e-brake cable loops around - basically takes 1 pull input and splits it into 2 to both ends of the cable at each wheel.

at the connection between the single linkage and the saddle there's a threaded rod that you can wind in/out to adjust cable play. it's a bit of a pain to get to as it's above the exhaust and propeller shaft, but it is do-able with both in place.