LM3 Front Brake Master Cylinder Rebuild?

[Vince in Milwaukee]

From best I can tell, my front brake master cylinder is leaking.  Where exactly it's coming from has me stumped.  After a bit of riding, say 10 miles or so, there are small spots of brake fluid on the right side of my gas tank.  I was just out in the garage and cleaned everything up in that area.  I then took some toilet paper and tried various locations to see if I could get fluid on it.  No luck.  Any advice / help most appreciated.  Oh yeah, it's the round, 12mm one.   

[dxhall]

I would look for a break in the hose, particularly at the crimp.  Then I would look for a leaking seal at the caliper.  You can probably get new seals from Powerhouse in the U.K.  They advertise on eBay.

[RinkRat II]

  It won't be pretty but spritz it down with baby powder and it'll show up.

       Paul B

[rodekyll]

It might be coming from the rear seal on the piston.  Pull the boot back and see if it's damp in there.  I got struck with firewood once and it loosened a brake banjo.  I thought it was a broken line, but tightening the banjo stopped the leak.  You might get that lucky.

[Diploman]

You can easily rebuild the MC with this Brembo kit:

http://www.mgcycle.com/index.php?main_page=product_info&cPath=110_112&products_id=754

Better yet, you can bring your front brake up to date with a new 12mm Brembo MC with integral reservoir and brake switch built in.

http://www.mgcycle.com/index.php?main_page=product_info&cPath=110_112&products_id=1037

[dxhall]

I am surprised that a Brembo rebuild kit is available in the US.  I have read several times that Brembo will not sell kits here because they fear that a backyard guy will install one wrongly, crash, and sue them.   

[Antietam Classic Cycle]

I am surprised that a Brembo rebuild kit is available in the US.  I have read several times that Brembo will not sell kits here because they fear that a backyard guy will install one wrongly, crash, and sue them.

That seems to be true for the later ('98 on?) stuff. "Classic" stuff seems to be in good supply.