` Michael also had a strong weekend and is getting more up to speed with every race , although circumstances beyond his control limited his race performance in Melbourne and Sepang . Mercedes team boss Ross Brawn says Michael Schumacher not to blame for problems . Seven-time world champion retired in third race of his F1 comeback in Malaysia . Brawn expects the 41-year-old to keep showing improvement in Chinese Grand Prix . The German driver has been plagued by reliability issues since returning from a broken leg suffered at last year's Australian GP.
Mercedes team boss Ross Brawn says Michael Schumacher not to blame for problems . Seven-time world champion retired in third race of his F1 comeback in Malaysia . Brawn expects the 41-year-old to keep showing improvement in Chinese Grand Prix . The German driver has been plagued by reliability issues since returning from a broken leg suffered at last year's Australian GP.