Brakes
If oil leaks into the brake booster, the brake booster diaphragm may rupture causing a loss of power braking assist, and increasing the risk of a crash.
Oil from the engine may leak into the power brake booster, causing internal damage to the diaphragm. This would result in loss of power brake assistance. Dealers will replace a vacuum line free of charge to resolve the concern.
Audi notified owners of affected vehicles starting in September 2014. You can check with your dealer to see if your vehicle is involved in this program. It is helpful to have your VIN (Vehicle Identification Number) on hand when you contact them. The Audi recall number is 47L8.