"Drum Brakes: Principles of Operation" pt1-2 1983 US Army Auto Mechanics Training Film

More at auto-parts.quickfound.net "HYDRAULIC BRAKES: PRINCIPLES OF OPERATION, PART 1 (DRUM BRAKES)" "THIS PROGRAM DEMONSTRATES THE BASIC PRINCIPLES OF HYDRAULIC BRAKE SYSTEM OPERATION. USING THE M151 WHEELED VEHICLE DRUM BRAKE SYSTEM, THE FOLLOWING MAJOR COMPONENTS ARE IDENTIFIED AND SHOWN IN OPERATION: MASTER BRAKE CYLINDER, WHEEL CYLINDERS, BRAKE SHOES AND ASSEMBLY AND BRAKE DRUM." Public domain film from the National Archives, slightly cropped to remove uneven

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