Around 70,000 Audi AG cars sold worldwide will be sent back to the factory owing to potential problems with braking systems.
An Audi spokesman said that the potential failure might be caused if the engine oil enters the brake servo through the vacuum lines and makes it rupture. No accidents have been reported so far.
The recall affected the A4, A5, A6 and A7 sedans and the TDI turbo diesel engine variants of the Q5 and Q7 crossovers built between March and December 2012.
