Here is a few sites that might help you out. I have been wanting to rebuild mine for a while.
I am getting tired of putting it on the lift removing the cotter pins and adjusting it about once a month. From the 1st one you can find his other videos on you tube.
[ame]https://www.youtube.com/watch?v=J3xpRsijig0[/ame]
Handbrake Assembly - Parts For XJS from (V)139052 to (V)179736 | Jaguar Heritage Parts UK
Brakes » Restoration of NNF 10H