The recall affects Audi A4, A5, A5 Cabriolet, A6 and A7 models built between March and December 2012, and only affects cars with the larger-capacity diesel engine. A total of 1240 vehicles are involved in the recall in Australia, while some 70,000 cars are affected worldwide.
According to an official notice posted on the Australian Competition and Consumer Commission's product recalls website, the defect is that "engine oil may enter the brake servo via the vacuum lines", which could cause "the diaphragm in the brake servo can rupture, causing the brake servo to fail".
The outcome of such a failure would increase stopping time and distance, "posing a potential accident hazard to the driver and other road users".
Audi Australia confirmed the details of the recall, and a spokesman for the company said Audi will be communicating with customers in September.
The fix time for affected vehicles is one hour.
Owners after more information can contact their dealership.