750 F2 - Seized or awkward brake master cylinder?

[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.

[Bryanj]

Next stage is finding a seal kit then taking out the mortgage to buy it!! Don't think anybody does aftermarket for those

[hairygit]

CMS has genuine in stock, 55 euros though!

[Bryanj]

Plus postage as well

[hairygit]

Okay Bryan! But we did the first bit, found them! Now you need to decide, sell a kidney or re mortgage the house!

[Bryanj]

 CB750FA (77) 750 SUPER SPORT, JPN, VIN# CB750F-2100011 TO CB750F-2111489
 CB750FA (78) 750 SUPER SPORT, JPN, VIN# CB750F-2200001
 GL1000A (78) GOLD WING, JPN, VIN# GL1-4000001
 GL1000A (79) GOLD WING, JPN, VIN# GL1-4100003



43530-410-305 £42 at Dave Silver but out of stock, worth trying your local dealer as most of them deal with a big firm Leeds way(cant remember the name, maybe Hi Level)) and the have a huge catalogue you look up by bike, I got a pack of 5 caliper seals for a 1200 wing for less than the price of 1 honda but only by cross refering the sizes

[Drew400]

Thanks all.

Mine was ordered (43530-410-305 from DSS) before I started the work and is sitting next to me as I type, pending the next phase, installation.

Maybe my order emptied the stock... apologies to anyone else out there needing one in a hurry!

D.

[onethumb]

I'm hoping mine is ok. It looked fine when I stripped it and at the price they are I thought I'd take a punt. Nothing to loose.
Haven't put any fluid in it yet though.


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[Drew400]

Fingers crossed for you.

Cheers,

D.