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Help, I rebuilt the Front Master Cylinder

  • Thread starter Thread starter Burk Ferden
  • Start date Start date
B

Burk Ferden

Guest
Hello everyone,

I have a problem and would love the help. I rebuilt the front master cylinder and now it wont pull fluid. I pump the leaver but it doesn't pull the fluid, I think I might have the master cylinder piston in incorrectly. I don't know where the rubber peices go.

Thanks!

Justin
 
To prime the master open the bleeder on the caliper and place a piece of tubing on the nipple like you are going to bleed it. Now suck on the line - making sure you don't suck fluid into your mouth of course. As you draw a vacuum the fluid in the reservior will be drawn down priming the master.

Good luck.
 
Wow didn't try that

Wow didn't try that

Nessism said:
To prime the master open the bleeder on the caliper and place a piece of tubing on the nipple like you are going to bleed it. Now suck on the line - making sure you don't suck fluid into your mouth of course. As you draw a vacuum the fluid in the reservior will be drawn down priming the master.

Good luck.
Click to expand...

I thought I put it together wrong because the fluid would slowly leak out the back where the leaver pushes the piston. Its a 1980 gs850.
 
Burk Ferden said:
I thought I put it together wrong because the fluid would slowly leak out the back where the leaver pushes the piston. Its a 1980 gs850.
Click to expand...

Sounds like you have at least one of the seals in the wrong way around. The wider end of the seal goes in the cylinder first.
 
Yup, sounds like you put it together wrong - you didn't mention the leak in your first post.

Regardless of that, priming the master is a common issue on GS master cylinders - the vacuum trick works well.
 
Or I am missing one. There is a rubber seal I didn't put back in. I thought it was for the circular master cylinders. I have the product pictured below. The way i put it in the cylinder is. Spring, large round seal, piston then the circlip then the rubber boot. What I notice is that the front of the Piston and the large rubber seal are past the intake hole from the reservoir so there would have to be a seal in the back. I don't know. This sucks
 
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Does anyone have an exploded view of the rebuild kit in the order it would go together. The fiche doesn't really help.
 
go on basscliff's website and download the 850 shop manual. they tell you how to take it apart and put it back together.
 
I have the clymer manual but it doesn't show the exploded view of the front master cylinder, just the brake calipers.
 
So at this point I think I would like to just put a new front master cylinder on the bike since I got new Low bars. Would anything with a 13mm Piston work for my 1980 GS 850G? I could just find like a GSXR front master cylinder?
 
I bought a Magura generic master cylinder for my GS, actually I ordered it. When it came in I was disappointed it had a plastic body. It's suppposed to be a good unit but I don't care for it.

It's brand new and I paid 90 dollars for it. If you don't mind the plastic you can have it for 30 dollars plus shipping. PM me if interested.,
 
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