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My 1970 M35A2C had been sitting for about 3-4 years now. I fixed the hydraulic head problem that was causing the lack of use. Now I turn to the brake system and discover no brake fluid in the master cylinder. There was a black paste on the bottom of the reservoir. I cleaned out the paste with some giant q-tips I have for gun cleaning. I filled it back up with Dot 5. Looking from the bottom, the entire master cylinder is wet with brake fluid and there was a drip coming off the bottom. My guess is I need a new master cylinder. This one was on the truck when I purchased it in 2001 from a dealer in Idaho. He obtained it from a government surplus sale, so the master cylinder has some mileage and age on it. Is it safe for me to assume I need to replace it?