I’ve never heard that one fails close to the other and I have plenty of anecdotal evidence to support the opposite as I’ve owned a few and only replace what failed and they never failed together or close to one another. And there are good and bad versions— for instance if I was to do both, I’d at very least get cast steel versions of the master such as Dorman as they have a much better track record. Jason also sells a kit on his site if you do both or you can make one with standard parts with slight mod to the mounting ears of the master which is pretty well detailed here:
https://www.defendersource.com/thre...onversion-defender-series-late-iia-iii.67611/
Or just buy it as a kit from Jason— he sells loads of too notch stuff. If you want stock or OEM, Zack at Rovers North is awesome.
The original Clutch Master Cylinder on a Land Rover Defender (model year 1983-2006) & Series late-IIA & III (model year late-1971-1984) trucks are made from aluminum, and as such is prone to having the inner wall of the cylinder wear over time…creating a situation where the clutch master may...
www.seriesdefender.com
Here is a helpful post on changing master.
https://www.defendersource.com/threads/best-way-to-change-clutch-master-in-a-95.38359/post-356606
Easy job, all or in part. Clutch is totally different animal. Way friggin harder. And if you are intent on that, I’d look into LOF clutches and replace your clutch fork with a strengthened one or do the HD mod to yours. What I’d do at least. Pre nets break through.