• Required reading for all forum users!!!

    Welcome!
    Register to access the full functionality of the GSResources forum. Until you register and activate your account you will not have full forum access, nor will you be able to post or reply to messages.

    A note to new registrants...
    All new forum registrations must be activated via email before you have full access to the forum.

    A Special Note about Email accounts!
    DO NOT SIGN UP USING hotmail, outlook, gmx, sbcglobal, att, bellsouth or email.com. They delete our forum signup emails.

    A note to old forum members...
    I receive numerous requests from people who can no longer log in because their accounts were deleted. As mentioned in the forum FAQ, user accounts are deleted if you haven't logged in for the past 6 months. If you can't log in, then create a new forum account. If you don't get an error message, then check your email account for an activation message. If you get a message stating that the email address is already in use, then your account still exists so follow the instructions in the forum FAQ for resetting your password.

    Have you forgotten your password or have a new email address? Then read the forum FAQ for details on how to reset it.

    Any email requests for "can't log in anymore" problems or "lost my password" problems will be deleted. Read the forum FAQ and follow the instructions there - that's what we have one for...

  • Returning Visitors

    If you are a returning visitor who never received your confirmation email, then odds are your email provider is blockinig emails from our server. The only thing that can be done to get around this is you will have to try creating another forum account using an email address from another domain.

    If you are a returning visitor to the forum and can't log in using your old forum name and password but used to be able to then chances are your account is deleted. Purges of the databases are done regularly. You will have to create a new forum account and you should be all set.

Master Cylinder Help

  • Thread starter Thread starter climber_dhl
  • Start date Start date
C

climber_dhl

Guest
I have a question regarding the Front Break Master Cylinder for my GS850G (1980). My brake system was in pretty bad shape so I rebuilt the calipers. Next I ordered a rebuild kit for front Master Cylinder except when it came ( a week and a half later) it was the wrong one. I went to the store and returned it the manager had me look at the OEM kit for my bike to make sure it was the right one. And of course it wasn't. I look through my shop manual and the type of master cylinder I have does not match any of the years in my manual. If someone could help me find the part or at least tell me what kind it is (part number,or type/year of bike, etc...) I would appreciate it very much. I thought it might be an aftermarket part but the master cylinder looks like the oldest part on the bike and it is in really bad shape (hence why I am rebuilding it). Thanks for all you help.
 
Last edited:
Piston Cup

Piston Cup

Here is a close up of the piston cup set. Thanks
 
Here's a little something

Here's a little something

Hi Mr. climber_dhl,

I saw a complete (used) front brake system for a 1980 GS850 on ebay. I sent you an email about it. I'm not familiar with the master cylinder in the picture. It's also possible to put aftermarket or other bike's master cylinders on these bikes too. Check with the experts for compatibility.

Thank you for your indulgence,

BassCliff
 
The M/C could be from any make of bike. If you look underneath it it may have a stamp showing 1/2 meaning it is a 1/2 inch bore. You can reuse the piston and spring, but usually the rubbers are the culprits.
You really just have to replace the two rubbers seal rings on the piston and any kit that uses those can be fitted as long as they are 1/2 inch.

Try this site, they give you sizes and you may be able to match your size
http://motorcycleproducts.co.uk/cat...r-kits-c-108_296_398_1900.html?page=2&sort=1a
 
That master doesn't appear to be the stock one. As long as the seals are not damaged, cleaning the master and assembling it back together often doee the trick.
 
I need a new one though. The main boot on the piston is shredded. Recommendations?
 
My opinion get a good used "correct" one. at least you will know where to start if and when you need to repair it.
down side, you may have to get the lever for it also.
check the brake light switch, is it different than the clutch side?
 
You must log in or register to reply here.
Back
Top