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Anyone come across this problem before? Been trying to fix a problem with rusty rear brake discs... so bought a new (Lucas) Master Brake Cylinder. After reading around this forum and others, it seems the best way to "prepare" the MBC for installation, is to pre-bleed it in a vice - before installing to vehicle. It's the first time I've tried this.... After 2 hours of trying (in the vice) ... using brand new DOT 4 fluid - I gave up. See photo! I'd rigged up a closed loop system... and allowed up to 30 minutes between pumping sessions - to allow any trapped air to "Rise". For the love of god... I could not get the rear brake circuit free of air bubbles... I've now sent it back for a replacement. The front circuit was perfect - nice clear, bubble free, fluid flowing around the loop... Is there some trick I'm missing?