Slow Leak Coming Out of Frame Rail

[Toon]

Put a paper towel under the brake booster and see if it gets wet.

This is a good idea!!

[Undiluted]

Looking more like a brake fluid or a leak from inside of the firewall or the outside.

[audiquattrot]

bumping this thread up. I've been chasing this same issue for months. Bone dry behind the clutch master, slave cylinder recently replaced, bushings on the master cylinder holding the reservoir replaced, and all hard lines bone dry.

Only dripping out of that frame rail hole. Any other ideas on where it could be coming from?

[E30 Wagen]

Was it ever confirmed to be a fluid? How does it feel and smell? If nobody can confirm it's actually brake fluid then I wonder if it's just water? Condensation builds up in the frame, catches a lot of dirt/grease, then gathers and drips?

[audiquattrot]

Was it ever confirmed to be a fluid? How does it feel and smell? If nobody can confirm it's actually brake fluid then I wonder if it's just water? Condensation builds up in the frame, catches a lot of dirt/grease, then gathers and drips?

def smells and looks like brake fluid as it's yellowish/clear in color. I was hoping it was residual from months ago when my slave was gushing out and had to replace it, but ive cleaned underneath several times, and the fluid does appear to be fresh coming out of the rail.