(copy/paste from old posts I have made a few times now - since this keeps coming up)I replaced my old stock master cylinder with one of these eBay units - just like the one starting this thread. It was one of the single best improvements I have done yet - BIG improvement in braking.
![](http://farm3.static.flickr.com/2393/2048903713_02eff93b69.jpg?v=0)
![](http://farm3.static.flickr.com/2231/2048903711_e9d1b18bd8.jpg?v=0)
![](http://farm3.static.flickr.com/2167/2048903707_2193138c50.jpg?v=0)
If you want to upgrade your master cylinder to one that will support one OR two discs (and REALLY improve your braking), you can get this style off of feeBay:
![](http://i19.ebayimg.com/03/i/000/80/5a/0c0b_10.JPG)
![](http://i20.ebayimg.com/07/i/000/80/5a/05b0_10.JPG)
This is apparently a very close copy (and a
very good one, at that) of the Nissin master cylinder? (it could even be made by them but there isn't any manufacturer markings anywhere on either of the ones I bought) This company sells them and I have bought and installed two of them on two different bikes ('73 CB500 & '79 CB750K) with fantastic results: The style I used were 14mm piston - works great for our Hondas - the stock brake hose and mirror even fits the threads - and the brake switch hooks right up if you extend the wires and change the wiring connectors)
usa-motorcycles-incHowever, they seem to be running fewer of these at auction than they used to and are jacking up the price. (I bought both of mine at $39.95 each - now the same style is $49.95+)
You don't have to be particular with what brands they post in the title as long as its the 14mm piston model and it looks like this picture. . .they are all the same. I have noticed bidding wars over $80.00 on one that says "VTX" or Shadow or something while the exact same part in a different auction goes for beginning bid ($49.99) . . . . lol.