Master cylinder scrap?

[fatfreddy]

When I failed in my efforts to bleed my front brake, I took the master cylinder apart and found it all gummed up and nasty. There seems to be a bit of corrosion at the bottom of the bore but what I don't know is if this means I should be ordering a new master cylinder rather than a rebuild kit.

Any advice appreciated!

[ypvs400]

It depends on the extent of the corrosion, see if it will clean up with some 800 wet/dry wrapped around some wooden dowel or buy a fine stone small cylinder hone to use in a drill, if it cleans up quickly leaving no pitting you will be OK.

[fatfreddy]

I’ll give that a try. Cheers!