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McLaren MP4-21 - grooved brake discs 28 May 2006

Not strictly a new feature, but a key one at Monaco. Brake wear is not a problem here. Instead the low speeds mean the issue is keeping the brakes up to working temperature. The only heavy braking points are at the chicane after the tunnel, and to a lesser extent the Ste Devote and Mirabeau corners. With a lack of temperature, brake bite becomes a problem, as the surface of the carbon brake disc becomes smooth as glass, reducing friction between the pads and the disk, hence lessening braking power. To combat this, Montoya adopted discs with radial grooves that increase the bite rate between disk and pads, hence increasing the average temperature of the brakes.