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Master cylinder rebuild GS1100E

  • Thread starter Thread starter cdnoel
  • Start date Start date
C

cdnoel

Guest
Trying to pull the piston/pump out of my front master cylinder as I have a rebuild kit on order. I have the dust seals, circlip, and washer out but I can't get the piston out. I see some round parts inside but they seem pressed in or frozen. As of now I'm just letting it soak in some Kroil oil. Any one have advice on pulling out the piston or getting these parts dislodged? I have rebuilt the cylinder on my honda before but nothing was frozen on that one.
 
How about blowing some compressed air in though the discharge port to push the piston out backwards?

Oh, and once you get the piston out clean the bore carefully and inspect it using a flashlight to look for pitting in the metal. Pits are bad, and will cause leakage.

Good luck,
 
Try and tap the piston in a bit, if it moves clean out the barrel and wrap in in a cloth and try to blow it out with compressed air

Edit: Nessism got to you first while I was typing
 
not the caliper.

not the caliper.

I hear of the compressed air working on the calipers but I don't see how it will work on the master cylinder. With two holes under the filler reservior and the piston seal leaking I bet the air wouldn't work. Suppose I'll try the oil and tapping till I get some movement. I'll buy some PB blaster as well unless someone knows if I need to force it out somehow.
 
Take a look at these pics

http://www.thegsresources.com/_forum/album.php?albumid=316

By mounting the brake lever backwards, I was able to hook the brake lever under the groove in the piston. Use the lever to push out the piston. Make sure you have removed all the clips. There is a wire circlip that holds the boot on and a snap ring that holds the piston in place.
 
Thanks.

Thanks.

Thats sure a smart trick. I got mine out by wraping a wire around the groove. I grabed it with pliers then smacked the pliers a few times. Tried that earlier but it didn't work then. Took me an hour to find the little round shim that went tinging across the floor.
 
cdnoel said:
I hear of the compressed air working on the calipers but I don't see how it will work on the master cylinder. With two holes under the filler reservior and the piston seal leaking I bet the air wouldn't work. Suppose I'll try the oil and tapping till I get some movement. I'll buy some PB blaster as well unless someone knows if I need to force it out somehow.
Click to expand...

A small g-clamp with a bit of flat rubber over the holes or a bit of wood in a vice to hold the rugger and the airduster tip poked in the banjo hole through a bit of shop cloth can do wonders!
 
cdnoel said:
I hear of the compressed air working on the calipers but I don't see how it will work on the master cylinder. With two holes under the filler reservior and the piston seal leaking I bet the air wouldn't work. Suppose I'll try the oil and tapping till I get some movement. I'll buy some PB blaster as well unless someone knows if I need to force it out somehow.
Click to expand...

With the resevoir removed - A small g-clamp with a bit of flat rubber over the holes or a bit of wood in a vice to hold the rubber and the airduster tip poked in the banjo hole through a bit of shop cloth can do wonders!
 
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