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i just got a komatsu wb93r backhoe loader and not sure what fluid to use in the brake master cylinder?
right now its got a thick dark coloured oil in it!
Sorry, not a lot of Komatsu backhoes around here. If you can't find it online, you need an owners manual. The wrong fluid could cost you a lot more than the wait and price of the manual. Probably a hydraulic oil, but that's just a guess.