My truck did the same thing, master cylinder took a dump and leaked into the booster. I couldn't figure out where the fluid was going till I pulled it off. Took it to O'reilly's and got a rebuilt one for about $20.
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RJD
1984 Chevrolet C30 welding truck 454/SM465
1977 GMC C15 pickup 350/TH350
1970 Chevrolet C20 pickup 350/TH400
1970 Chevrolet K20 Suburban 454/TH350
1969 GMC 8500 478M V6/5 spd winch truck
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