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1275 / 1500 brake MC... Can they be rebuilt?

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just rebuilt mine - haven't tested it though - I think it depends on the condition of the cylinder - VERY easy to do though and cheap enough to be worth a try
 
I have done it successfully, though it took two tries.

I like this kit

https://www.bpnorthwest.com/.sc/ms/...aster Cylinder Kit OE MGB 68-74, Midget 69-79

better than the ones available from VB/Moss because it uses a rubber spacer in favor of the nylon spacer.

The two biggest challenges are 1) removing the nylon spacer and 2) removing the second circlip.

The best way to remove the nylon spacer is by melting it out with a torch. Trust me on this one!

As for the second circlip, you will need a circlip tool with very, very long tips. I could not find such a tool, so I modified a pair of needle nose pliers with an angle grinder.
 
I rebuilt one many years ago, and it did pose some challenges (as Morris mentioned) but it wasn't terribly difficult. It is certainly cheaper than a new or rebuilt unit. But if you can not get the bore cleaned up, then go ahead and have it professionally rebuilt. This is no place to try and get by with marginal parts.
 
I used a hone and drill and cleaned it up and put in the new stuff and it seems fine. I think most fail because people don't hone the bore good. If its shiney slick in there then that won't work. You gotta have that hone to give something for the fluid to catch on.
 
Excellent... time to buy a new tool! :wink: Found a local tool store that has a kit of three hones, goes from 1/2" to 3.5", for thirty bucks. That, a rebuild kit, and a couple of hours of my time is better than the $200 they're asking for a new MC.
 
I've always used an Ammco brake cylinder hone. Tripod type with adjustable tensioner. Slow speed and a back-and-forth motion to try and get a 45* cross-hatch. Cutting oil or Marvel Mystery oil for a lubricant.
 
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