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550 k0 1974 front brake master cylinder

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Mark sharman:
Hi all
Thanks for your kind welcome into the group.
I have a couple of questions regarding my master cylinder that i  have just managed to disassemble.
the plunger check valve and rubber were stuck fast but managed to free eventually but this has left a small amount of pitting in the chamber .This is such a shame as once cleaned the out side looks like new.
1.can this be repaired(I'm thinking not)but not sure?
2.if not does anybody know the best place for a replacement?

Also on the under side of the master cylinder is a small plate which holds the rubber cushion for the clutch lever is this zinc plated or painted.
it was so rusted a couldn't tell.   
TIA
Mark

 

mickwinf:
Would probably leak before long. There is a possibility of having it lined with stainless, I have seen companies advertising this. Personally I ended up getting a repro from silvers as could not get a good feel with rebuilt original.

McCabe-Thiele (Ted):
I fitted the DS one as my old unit seemed to have a lot of free play before anything moved inside the master cylinder itself.

The DS one I found was brilliant with hardly any free play at the lever end.

deltarider:
Most of us opt for the repro which performs even better than OEM. Cost is about the same as a rebuild set. In my case: €55,- instead of €46,50. The lid of the old OEM can be used on the new repro.

Bryanj:
If you have one of the nicro(ball) hones of a small enough size you could try a very light hone as long as you already have the kit, otherwise as others said get the Dave Silver one.
I would suggest checking the flexi hoses, the first US one i did the hoses were so solid i had to push a welding rod through to clean them, outside was perfect with no cracks or i wouldnt have bothered.
Strip and clean the caliper as well, if piston pitted replace with stainless plus scrape out the seal groove with a dental pick

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