Dirty Clutch Fluid

After a couple days of hard driving on track, my gears start to clash. It seems like the pedal has less travel and a quick bleed of the clutch fluid fixes the problem. The fluid that I get out is dark and feels different, like it's mixed with grease or oil. Running a half pint of fluid through the system cleans it up nicely and everything works right again.

The setup is a 1" Wilwood master in a Tilton pedal box with a remote mounted reservoir, LS1 throw-out bearing modded by TPC, SPEC fw/pp/disc, Motul RBF600 fluid and a remote bleeder. I pulled the inspection cover and everything looks nice and clean in there, no leaks evident.

Any ideas where/why/how the fluid is getting fouled?

Rich

Could you have a leaky master? It may be taking some of the dye out of the seals?

Yeah, same here. Mine turned blackish after installing and bleeding. That was with the master mounted without an angle on the firewall. After I had an angled mounting plate made, I flushed it out and all is well. Best guess is either the seal is rubbing the inner bore of the master (because the angled adapter fixed mine) or what zeus said and its just assembly material/lube.

Interesting. Thanks for the thoughts, Guys. I have to assume the angles are right given this pedal box I'm using. It's pretty much an ideal mounting situation for the master. I'll just keep bleeding it every couple of days on track and hope it clears up.

Rich

This happens ALL the time with c5 vettes. I had a turkey baster for the clutch fluid and a tone of dot3 and dot4 cause the clutch pedal would stick to the floor. This in an area with 68' high summer temps. Redid all fluids didn't help much, used the cheap stuff cause the black would cause the need for a change more than time or heat. Thought that p cars were more immune to it cause nobody talked about it. They analyzed it and said it was clutch disc powder. Look up ranger method.