I had noises on two occasions. Once, there was a "click" when the pedal was nearly all the way depressed. Clutch master was leaking. Next time (more recently), there was a slight squeak when depressing the pedal. I flushed w/ new Valvoline dot 4 synthetic brake fluid and all has been well since. The clutch fluid turns brown much sooner than brake fluid. I think the turning brown is heat-induced. Once it turns brown/tan, I change it.

'86 4Runner: ARB winchbar, Kaymar, e-codes, OME lift, RR diff lock, FR truetrac, sound stream a/d/s audio, recaros.
'03 LX470: ARB sahara bar, Kaymar, HID's, ART cryo'd/slotted rotors, Stoptech SS hoses.
'01 Prelude SH
'00 CRV