Just had a look and seem to have (hopefully) fixed the problem.
It looks like the worn pads meant that the actuation arm was cycling too far through its travel. After I wound the pads in manually with the 3mm adjusters on the side and released cable tension from the actuation arm it now seems to be working normally again.
I still don't know if I entirely trust it, but at least it's working
Yeh when you set them up, pull the cable tight and then clamp it in the actuator when it's in it's full released position; don't "preload" the actuator.
Just had a look and seem to have (hopefully) fixed the problem.
It looks like the worn pads meant that the actuation arm was cycling too far through its travel. After I wound the pads in manually with the 3mm adjusters on the side and released cable tension from the actuation arm it now seems to be working normally again.
I still don't know if I entirely trust it, but at least it's working