| 摘要 |
A brake disk includes a central hole so as to be connected to a wheel shaft and a serrated periphery which includes a plurality of first protrusions and a second protrusion is located between any two adjacent first protrusions. Two recesses are connected between the second protrusion and the two adjacent first protrusions. A plurality of first grooves and second grooves are defined in each of two sides of the brake disk. Each second groove communicates with the first groove corresponding thereto so that rain drops, dust and debris from lining plates of calipers can be easily removed from the brake disk.
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