Leaking front brake reservoir

Mines weeping as well. Started about 4000km in. Doesn't make a mess, just annoying.

with a little bit of weeping/sweating the problem is not the fluid getting out. It would take a pretty long while before you'd have to add fluid.
The problem is that if brake fluid can get out, water can get in. Especially with the hygroscopic nature of brake fluid. Water in the brake fluid will degrade it faster and (in very extreme cases) could cause it to boil, leading to loss of brake pressure.
Keep an eye on the fluid color and replace in time when needed.

Snail 72, I think you might be doing something wrong.

Where are you bleeding it from?
It sounds like you are trying to do it at the banjo fitting up on the reservoir.
You should be bleeding it from the bleed nipple down on the caliper.

You note a small air bubble or no visible bubble, are you referring to the sight glass on the reservoir?
There should be a bubble there when it is level on all planes, other wise it is over full.

DuibhceK,

Yea these BMW/Brembo set ups suck and I don't doubt water is getting in.
Both the X-Challenge and the Terra's fluid looked like black coffee in the course of a few months.
Most other bikes would still be clear even after a few years, or at worse a bit darker.

You MUST have a very small leak somewhere, otherwise air can't enter a closed system.
Either somewhere along the lines, fittings or wheel cyl.
But air IS entering somewhere (and most likely fluid leaking out) otherwise they can't get "spongy".
See your dealer for a check.


Slight weep here, too....bike's never been on the road yet

Mine weeps too. Being replaced under warranty as I type this message.

From both. at the top of the reservoir once you put off the cap the is a small allan key to bleed the master... once i do the master it comes good but when i flushed out the system i did both.

Huh, is there a cap under the diaphragm where this allan key is?
I have never seen it, but I am thinking it is where I have a small button looking indent.
Is your bike an ABS bike? Are the reservoirs different?

Under the cove/diaphragm just before the banjo fitting you will need to wipe it with a cloth to see it, its part of the housing a 3mm allan key to bleed the master cylinder. nope my bike isn't a ABS bike.