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Mercedes F1 W04 - enclosed brake drums 07 July 2013

Mercedes have followed Lotus's lead with these enclosed brake drums. Instead of the heat generated by the brakes spilling on to the outside of the wheel, it is expelled towards the inside upper half of the rim (small red arrows). This is designed to improve the diffuser's efficiency. The large red arrows show how exhaust gas is directed to the side channels of the diffuser by two vertical fins.