Reply to "Black stuff in clutch master reservoir"

panterapattMember

DOT 3 and 4 are "supposedly" the same other than 4 having a higher boiling point and being less hygroscopic. But some info suggests that older systems do not "like" 4 and you should use 3 only. I have used 4 in my car for many years now. The brake fluid tends to "yellow" with time - been 3 years now since I last changed/bled it. The clutch fluid seems to stay clearer and not yellow as much (why I have no idea) but occasionally I do get black stuff (not pieces but just a black slime). My clutch master is probably 20 years old and my slave is a CNC I bought from Dennis Q. at that time. The clutch works fine so I have just sucked the black fluid from the reservoir and refilled it and then bled the system.

5/13/231:34 PM

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