Technical problems with braking systems and weak demand in China saw third quarter profits fall 84% on the year to €476 million ($512 million) at German carmaker BMW in results published on Wednesday. Reduced unit sales led to a fall in turnover to €32.4 billion, down 16% on the year. The problems led BMW to cut its forecast in September. Pointing to the difficulties, board chairman Oliver Zipse said: “After the extraordinary challenges in the third quarter, we are looking ahead: In the fourth quarter, we are back on track for stronger earnings in order to achieve our annual targets, despite p…