• 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.

1980 gs550e front master cylinder issues

  • Thread starter Thread starter loclhst
  • Start date Start date
L

loclhst

Guest
I tried looking around the forums but could not find anything specific to the '80 550e.

My front MC started to leak...as in it no longer wanted to contain any fluid at all.

I tried to pull it apart, but it was stuck bad. Ended up ordering a used one off ebay, it looked clean enough so I didn't bother with a rebuild....well that was a mistake.

This new one is at least holding fluid, but its leaking as well.

since I cannot find reference to the correct parts, can someone either point me to the right direction to the correct part number for the front master cylinder rebuild kit or a correctly sized piston with a new aftermarket?

This is a single disc break bike (though I was told I should look at doing the dual disc upgrade in the future)

I am fairly new to this whole "do it yourself" vehicle fixing stuff, so bare with me as i ask silly questions.

Thanks in advance.
 
loclhst said:
I tried looking around the forums but could not find anything specific to the '80 550e.

My front MC started to leak...as in it no longer wanted to contain any fluid at all.

I tried to pull it apart, but it was stuck bad. Ended up ordering a used one off ebay, it looked clean enough so I didn't bother with a rebuild....well that was a mistake.

This new one is at least holding fluid, but its leaking as well.

since I cannot find reference to the correct parts, can someone either point me to the right direction to the correct part number for the front master cylinder rebuild kit or a correctly sized piston with a new aftermarket?

This is a single disc break bike (though I was told I should look at doing the dual disc upgrade in the future)

I am fairly new to this whole "do it yourself" vehicle fixing stuff, so bare with me as i ask silly questions.

Thanks in advance.
Click to expand...

You did a nice job finding the GSR. Welcome. Now you need to continue on your quest for knowledge and now search for OEM Suzuki parts. Parts Outlaw is one of the forum favorite sources (in the USA) so you may want to check them out.

BTW, since your master cylinder gave up the ghost you should bite the bullet and tear down and rebuild the entire brake system. Pop out the piston in the caliper, replace the seals, and replace the brake line. Maintenance is good.
 
For a single caliper system you want a 14mm bore, for a dual caliper set up you want a 5/8" bore.


Mark
 
Visually, all parts look the same. Except I cannot verify the piston parts as I could not get them out on my old master cylinder.

As far as a rebuild, perhaps at the end of this year. Last night when i replaced with the used part, everything seemed solid. At least for now.

After checking this morning, there was not much leakage, so what I saw last night could have just been from spillage or something. I will keep an eye on it for now.

Since this is the only bike I have, I would rather not take it out of commission, even for a few days. Especially after last years carb issued (since been fixed).
 
Last edited:
loclhst said:
Visually, all parts look the same. Except I cannot verify the piston parts as I could not get them out on my old master cylinder.
Click to expand...

I don't know if this was in reply to my post on the M/C size or not. The bore size should be cast into the body of the M/C somewhere so you can confirm bore without stripping it all apart.


loclhst said:
Since this is the only bike I have, I would rather not take it out of commission, even for a few days. Especially after last years carb issued (since been fixed).
Click to expand...

While I understand the sentiment, riding with a suspect brake system is a significantly bad idea and might ruin a lot more than just a few days of riding this year.


Mark
 
Thank you all for the replies. So far she does not seem to be leaking anymore without the rebuild kit. I guess what I saw as leaking was a little spillage. I do at least have the rebuild kit on the way in case I have problems.

As far as the complete rebuild of the brake line, I will keep an eye on everything and look at doing that at a later point. I understand the consequences if something does happen.

Thank you all for the input.
 
If the master cyl is stuck and you can't get it apart you need to drill a hole through the center of the bore out the blind end so you can drive out the piston assy with a punch. Then tap the hole for a 1/8 " pipe plug it's good to go, also if the bore is pitted consider having the m/c sleeved.
 
mustangflyr said:
If the master cyl is stuck and you can't get it apart you need to drill a hole through the center of the bore out the blind end so you can drive out the piston assy with a punch. Then tap the hole for a 1/8 " pipe plug it's good to go, also if the bore is pitted consider having the m/c sleeved.
Click to expand...

I will work on my original one with a friend. I will look into this, though i am not a fan of tapping a hole and plugging it up just to pop it out. In the mean time, I was able to pick up a used and clean one on ebay which is currently working for me.
 
You must log in or register to reply here.
Back
Top