I've been neglecting work on the emergency brake in my 68 145 since I purchased her in February, and given I don't 100% trust the primary brakes (for another post), it's high on the list now.

The problem is that pulling the brake handle up as far as I can does essentially nothing. At speed it is a barely perceptible grab. Standing still, the car will roll forward down a hill with very little additional resistance, and will roll backwards down a hill, but with much more resistance, sometimes almost enough to keep the car stationary. In fact, the only thing normally keeping the car parked is that it's left in gear (manual).

I've seen how the cable linkage makes it way to the rear, then splits so there's one for each rear tire. Beyond that, I don't know much about this system. What are the common points of adjustment, if that's what I need? How can I check for other possible issues in the system?

Thanks!