Internal Expanding Rear Brake Drum Assembly-100 mm

This is an inside view of our internal expanding rear brake drum assembly in 100 mm. Here is a curious little item, an internal expansion drum brake assembly. Unlike most small scooter brake units that use brake shoes that contract or clamp-down to provide the pressure, this brake unit's shoes expand outwards to grip the inside of the drum. External labeling states this is a "Servo Brake" from Xun Lin Brake.

This is the 100 mm unit. There is also an almost identical 90 mm version.