The event that has reappeared after a 25-year absence

In a little-observed growth again at Monza in September, we noticed the primary reappearance of the brake disc groove after a quarter-century absence. This was on the Carbone Industrie brake discs provided to the Williams crew.

Since then, Alpine has additionally raced them, operating them for the primary time in Mexico. Carbone Industrie provides six of the ten groups with discs so we could also be seeing the characteristic seem on different automobiles subsequently.

However what’s the significance of the 4 grooves, reduce diagonally into the carbon fibre discs?