Brembo Serie Oro Brake Disc – Ref 78B40870. Brembo brake discs have a unique conformation that transfers braking torque more effectively while also improving resistance to thermal and mechanical stress. The Serie Oro is the product with which Brembo entered the racing world in the mid-70s, rapidly becoming the new standard in the sector where discs are concerned. 1x 78B40870 Brake Disc. Product Type: Brake Disc. High quality stainless steel construction. CNC machined anodised aluminium alloy housing. Transfers braking torque more effectively. Improved resistance to thermal and mechanical stress. You can send us a message by using the “Questions and answers” section towards the bottom of the page.