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Did Cangzhou replace the electric car with a lithium battery?

Three kinds. There are disc brake pads, arc brake pads and semicircular brake pads. Brake pot is also called brake drum, brake drum and brake hub. It is made of HT200-300 (i.e. gray cast iron):

1. Two arc-shaped or semi-circular brake pads are fixed in the cast brake pan, and the two brake pads are forced to extend outward when braking.

2. Rub the inner wall of the brake disc to slow down or stop.