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Overhaul of the brake master cylinder (MBC) in search of the reason why the brakes are stuck and the calipers do not release - they are blocked. Overhaul of the MBC pistons. The principle of operation of the brake cylinder. Diagnostics of the MBC with a pressure-vacuum tester gauge. Dirt in the MBC and replacement of brake fluid. Cleaning the filling and pressure relief holes in the MBC. How to diagnose a brake master cylinder with a pressure-vacuum tester gauge.