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750 F2 - Seized or awkward brake master cylinder?

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Drew400:
Hi experts,

I have decided to refurbish my rear brake master cylinder. However, having removed the awkwardly stuck circlip, I can't get inside it.

As you can see from the picture below, the circlip is out. I’m guessing (from the exploded parts diagram) that the 'this bit' marked in the picture should ease out (under pressure from the spring behind it?) and is only held in place by the circlip. However, it's not moving after some very gentle persuasion and WD40 soaking.

Any hints or tips on how to progress or explanations about what I’m doing wrong?

Thank you,

D.

Bryanj:
gentle application of heat

Drew400:
Thanks Bryan, will do.

onethumb:
Had the same problem as you. I got through it by wire brushing it then soaking it in wd40, putting a nut on the thread then putting that in the vice and using a bit of heat from a bit of a distance as bryanj said and moving it back and forth till it freed up. Took about 5 minutes.
Good luck.


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Drew400:
Thanks Onethumb,

I have now succeeded. It was as you both described: scrape away the old crap that gathers in there; leave soaking in WD40 overnight; dry and have another scrape; hold in the vice (gently); warm up with by butane burner(not too hot); then I used a claw hammer to lever gently in the plunger. It came away really easily, so hardly any leverage needed (thankfully).

Now for the next stage...

Cheers both,

D.

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