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Master Cylinder piston won't come out.

  • Thread starter Thread starter ThomasTedder
  • Start date Start date
almarconi said:
What did the clip you removed look like?

The one that holds the boot on is a piece of wire shaped like a half circle



The one that hold the piston on looks similar to this..
Click to expand...

That's the one I removed. I have a "special master cylinder tool" that I made. It's a fork with three of the legs bent down and one left straight. Works like a champ on CB's too.

Whew, glad I wasn't banging on it for no reason.
 
I had a master cyl rusted solid on my gsx250, using penetrene on it and topping it up each night for a week after removing the circlips didn't do a damned thing. Gave up after doing that, trying heat (couldnt use to much, given the res was plastic) didn't do a damned thing. Ended up with a master cyl from a gpx250 on there instead and it works fantastically (its all metal as well, im not a huge fan of plastic being used on the master cyl's)..
 
It's FREE!

The Berrymans and PB Blaster didn't do a damn thing. Neither did me and my brother playing tug-of-war. I drilled a hole and screwed a screw into the piston, then used a hammer to pry it out.

IMG_0839.jpg


IMG_0840.jpg


IMG_0841.jpg


IMG_0843.jpg



Thanks for the help.
 
I was going to suggest hydraulic pressure, connect the cylinder up to the brake line to the rear caliper, then step on the brake.
 
If there is rust in the bore you either need to hone or get a different one.
I like your ThomasTedder engineering. :D
 
Great work on getting the piston out.

Hate to say this but if the bore has pitting the master is junk. The master body itself is made from cast aluminum and should not be honed in any way. The bore surface is supposed to be smooth and shiny so grinding out imperfections will damage the finish and make the bore out of round. You can get away with cleaning it up on the inside with an old, worn out piece of gray scotchbrite pad (the low grit scotchbrite pad, not a red or green pad which is coarser). Get a strong light and look down the inside to see if the bore is clean. Typically, the bore will be damaged right where that old piston was sitting...ask me how I know.
 
Last edited:
Well done on getting them out.
And might i add, "i like the way you think!"
 
ThomasTedder said:
Thanks. I was just about to give up when the idea hit me. I think I may be replacing it anyway, though.


Will any 'ol Suzuki mc fit this bike?




?
Click to expand...

Pretty much, the ones for the "Ladies" model have the reservoir at a goofy angle when installed on normal bars, some of them have different angles where the banjo bolt goes in.

But any of them will make the brakes work.
 
tkent02 said:
Pretty much, the ones for the "Ladies" model have the reservoir at a goofy angle when installed on normal bars, some of them have different angles where the banjo bolt goes in.

But any of them will make the brakes work.
Click to expand...

What's a "Ladies" model?
 
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