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MG MGB Technical - Brake master cylinder rebuild

Next up.....brakes.

I've got the master cylinder out and am trying to determine if it's a rebuild or new cylinder. At 30+ years old I'm leaning towards new, but I'd like to at least look inside first.

Problem is I don't see how to get the nylon bearing (below the clip ring...below the outer spring) out. They say to move the piston up and down but that gets me nowhere. I tried the air pressure trick that worked on the clutch master cylinder but pushing out a pressed in (?) nylon bearing is a bit different then pushing out a rubber seal.

So, I'm down to either a custom setup on the bearing press or drilling the bugger out!

Any suggestions?

BH Davis

Did a little searching around and see that it is a well know issue. I think I'll try to drill a small screw hole to get a grip into, and if that doesn't work, drill a lot of small holes and break it up.

Thanks anyway!
BH Davis

I tried to rebuild and ended up buying new. If I were going it again, I would not rebuild. I would buy the clutch, slave, and master new. I would rebuild the calipers, and wheel cylinders.

Just my 2 cents
Frank Baker


Thanks for the input. I rebuilt the clutch master and slave last month and they are working fine. But, the brakes are another story and I've decided to use the new one.

BH Davis

This thread was discussed between 25/07/2007 and 26/07/2007

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