This is exactly why there's a universal recommendation to flush brake fluid every two or three years. Yes, this will clean up with a water scrubbing but the situation is the same downstream in the lines and clutch slave cylinder. In fact, when I attempted to drain the fluid via the slave's bleeder valve it wouldn't even pass this crud.
While in the process of dismantling the various systems on Project 37, a 1993 VFR750, I came upon this science experiment inside the clutch master cylinder. This is exactly why there's a universal recommendation to flush brake fluid every two or three years. Yes, this will clean up with a water scrubbing but the situation is the same downstream in the lines and clutch slave cylinder. In fact, when I attempted to drain the fluid via the slave's bleeder valve it wouldn't even pass this crud. Flushing/bleeding your hydraulics isn't difficult, costly or time-consuming, but, if allowed to reach this point, it's just the opposite. This will require a complete system disassembly, cleaning, new master and slave seals and ideally a hydraulic line replacement, which we're planning in any case. If you presented this to a shop you're facing hundreds of dollars in parts and labor. Flushing your own systems costs a $4 container of brake fluid and 30 minutes of garage therapy. Flush your fluids!
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