1990 C4 brake fluid issue

[lisa]

Hi,
I have blue brake fluid leaking out the overflow as if the system is getting pressurized backwards. I don't have any warning lights on or other warnings. The diff light is not on. The ABS is working (I hit it at an autocross a few weeks ago). Anybody have any ideas as to what might be failing? This is that complicated system and all parts are expensive.

Thanks

[Newsboy]

Are your brakes working normally, no lower pedal or other issues? Have you topped up the resovoir lately?

[lisa]

I bled everything a few months back, this started as a few drops below the car, to where now it is a serious back flow. The pump comes on then stops, the brakes work fine. I am guessing air is getting into the system somewhere. I just want to know if this happened to anyone else, and what did they find was failing? All of those various components could be at fault and everything is very pricey....