• 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 Geysers Brake Fluid?

  • Thread starter Thread starter Randomize
  • Start date Start date
R

Randomize

Guest
Thanks to Brendan, JT, and tkent for hounding me on checking my brakes because boy were they nasty. One of the front brake lines was clogged, meaning only one of the double discs was doing anything. It took a lot of poking around with a paper clip and then some compressed air but I was able to clear it.

The real issue is the front master cylinder. When I squeeze the brake, the crazy thing fires a stream of brake fluid up and out of the reservoir like a geyser. I'm guessing this means there's some kind of seal inside it that's shot? If so, would this be included in a rebuild kit or should I start shopping for a new MC?

At least the back brakes were fine.
 
The geyser is normal and shows that the fluid return and feed passage is open.

Regarding the brakes in general, you should perform a full system tear down: calipers, master cylinder, and replace the lines. That sludge which plugged up the line suggests the entire system is contaminated. Failure to perform proper maintenance on the brake system can get you killed. Please tell us you are taking this seriously.
 
+1 on the full rebuild (both MCs and all calipers) plus new stainless steel braided brakelines. There are oodles of threads on brake rebuilds, if you've read through them and have any specific questions, we're here to help.
 
Yep, the geyser is normal.

Put the cap on, or don't yank the lever so fast.



But yeah, if things got so bad that a brake line clogged, there's a lot more evil gunk in there waiting to kill you. You have to take it all apart, rebuild with OEM parts, and replace the brake lines. No way I'd ride anywhere until it's sorted.
 
Last edited:
Thanks, guys. Yes, rebuilding the brakes is now at the top of my to-do list.

Should I be concerned that the rear MC doesn't geyser or is it only the front one that typically does that? It blows my mind that it's normal for that to happen :lol:
 
Randomize said:
Thanks, guys. Yes, rebuilding the brakes is now at the top of my to-do list.

Should I be concerned that the rear MC doesn't geyser or is it only the front one that typically does that? It blows my mind that it's normal for that to happen :lol:
Click to expand...

The rear uses a reservoir connected to the MC by a hose. So the port that makes the geyser is much more covered up.
 
Between the gear oil and the brakes you now have hard evidence of the state of this machine and everything is suspect. Make sure that at some stage you check every nut,screw,bolt and split pin from nose to tail bearing in mind that for some unknown reason handlebar clamps always get overlooked.
 
You must log in or register to reply here.
Back
Top