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The Midland-Ross booster is a single diaphragm booster meant for drum brakes. The Bendix booster is a dual diaphragm booster meant for the disc brake master cyl. Granted, the Bendix is a smaller diameter than the Midland-Ross so that could be why it has to have a dual diaphragm.







I recently parted a nice clean all original 1969 Sat wagon that had 4 wheel drum brakes, and a dual diaphram Bendix booster....