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It is the master cylinder. The storage can cause water to accumulate in the master cylinder, forming a small rust area. When the brake is applied it causes the inner piston cup to slip over the slightly rusted area inside the cylinder thus causing a bypass of the brake fluid. Before you store the brick again it is a good idea to flush the brake system as water is always absorbed into the fluid. That's why it is called hydroscopic(water absorbing) brake fluid. If the fluid did not absorb the water you would have areas of the brake line with pure water in it. As most of us know water boils at a lower rate or degree than any type of oil or hydraulic fluid. Applying the brakes at a high rate of speed causes the pistons and calipers to heat up quickly. Water boils and you now have steam brakes. And we know that you can compress steam thus giving you a VERY spongy brake pedel. You can not compress, at least not real well, oil or any other liquid. It's just the boiling point that is dangerious. I have seen people actually use milk to replace the brake fliud in an emergency. One guy ruptured a rear piston, blocked it off with a nail, and used milk, which he was drinking, to replace the fluid until he got to a repair shop.
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Max..1989 244 DL 5 Spd., V15 Phase II Cam Bilstein HD, Turbo Swaybars, Poly Bushings all round, Turbo Wheels, Black leather interior, Electric mirrors, LED dash and gauge lights and now NEW ECODES with the turn signals, 1992 black 244 next project
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