If you're re-fitting the original twin discs, I've learned a couple of things from mine (assuming the twin-disc version sold in Oz is the same as the Euro one).
1. Don't bother chasing your tail trying to get rid of the small amount of play in the caliper sliders; I was misled by that, because for years I'd been on it like a hawk when the high mileage calipers on my GS Suzukis developed play it was a Bad Thing. When I stripped and rebuilt the XS calipers, I couldn't really find anything that was worn or out of spec, so meh.
Even with 48000 miles on my XS, the tiny amount of wear play was nothing to be concerned about.
2. If you fit a 14mm master cylinder with the standard twin calipers; sure, you'll get a bike that will stand on its nose, but you'll run the risk of running out of lever travel when the shyt hits the fan. I'd fitted a 14mm from some Kwack and that's what happened. I didn't like it much.
3. I ended up fitting a 16mm (5/8) master cylinder from a Honda Deauville. I still get excellent braking performance (much, much better than the original) but you come back into a safe zone, where you won't run out of lever travel. The Deauville mc has a nicely adjustable dog-leg lever, too.
4. Bonus - By also fitting a Deauville clutch perch and lever, you get a matching set up on the bars, and matching mirror mounts, which allowed me to fit a pair of GSX1100 mirrors. Fortuitiously, the new (old) Deauville clutch perch and lever definitely helped the clutch action towards a little bit more smoothness, but I need to delve into the innards of the pushrod / worm cam again anyway, as it's not quite what it should be.
ps. In all this, the use of braided lines is taken as a given.
1. Don't bother chasing your tail trying to get rid of the small amount of play in the caliper sliders; I was misled by that, because for years I'd been on it like a hawk when the high mileage calipers on my GS Suzukis developed play it was a Bad Thing. When I stripped and rebuilt the XS calipers, I couldn't really find anything that was worn or out of spec, so meh.
Even with 48000 miles on my XS, the tiny amount of wear play was nothing to be concerned about.
2. If you fit a 14mm master cylinder with the standard twin calipers; sure, you'll get a bike that will stand on its nose, but you'll run the risk of running out of lever travel when the shyt hits the fan. I'd fitted a 14mm from some Kwack and that's what happened. I didn't like it much.
3. I ended up fitting a 16mm (5/8) master cylinder from a Honda Deauville. I still get excellent braking performance (much, much better than the original) but you come back into a safe zone, where you won't run out of lever travel. The Deauville mc has a nicely adjustable dog-leg lever, too.
4. Bonus - By also fitting a Deauville clutch perch and lever, you get a matching set up on the bars, and matching mirror mounts, which allowed me to fit a pair of GSX1100 mirrors. Fortuitiously, the new (old) Deauville clutch perch and lever definitely helped the clutch action towards a little bit more smoothness, but I need to delve into the innards of the pushrod / worm cam again anyway, as it's not quite what it should be.
ps. In all this, the use of braided lines is taken as a given.