Civic handbrake

[Paul Wainwright]

Since replacing rear discs and pads, drivers side rear caliper and handbrake cable on my 51 plate civic the handbrake won't hold! Any tips? 

[Trevor]

Is it just the one wheel or both that aren't applying the handbrake?

If you jack one side up at a time and try to turn the wheel to see which one (or both) aren't holding.
Seems like it could need adjustment on the cable but worth pumping the footbrake at the same time as pulling up the handbrake on and off to see if the caliper winds in onto a closer tolerance