'89 B2. Rear brakes shoes are not moving. Pulled the bleeder valve and got about a spoonful of fluid after pumping the brake pedal 50 times. Replaced shoes about 3 or 4 years ago. They were working then. Master cylinder is only 3 years old. I'm thinking brake lines are clogged due to old fluid/never had a complete flush/age? Anybody have other ideas? I've never looked at brake lines before, but then I've never had a 37 year-old vehicle before.

