KNOWN FAULT · Audi

Vacuum brake booster whose membrane is damaged by oil vapour (Audi A4 B8 and Q5 3.0 TDI, 2014 recall)

Sources are not verified in real time and no entry confirms that your car is affected.

Engine / equipment: Audi A4 B8 and Q5 3.0 TDI (with other Audi models)
Period mentioned: Recall of August 2014
Symptoms: The brake pedal needs much more force because the brake booster assistance fails, and the stopping distance can grow.
Possible cause described: According to the ADAC, oil vapour can get into the vacuum brake booster membrane and damage it, so braking assistance fails. Dealers check the booster and fit a vacuum line with a non-return valve. It is free, takes half an hour and covered 36,600 cars in Germany (with other models); the action code is in the service book.
Check for the garage: Ask Audi by VIN whether it was done. If the brake pedal goes hard, press harder and go to a garage without carrying on with the car.
Cost cited in the source: Free under the recall.A rough figure from the original database, not an up-to-date quote.

Sources from the original database

Anonymous answer, no personal data.

How much does it cost to repair this fault?

Free under the recall.

A rough figure from the original database, not an up-to-date quote.

How is it checked?

Ask Audi by VIN whether it was done. If the brake pedal goes hard, press harder and go to a garage without carrying on with the car.

What are the symptoms?

The brake pedal needs much more force because the brake booster assistance fails, and the stopping distance can grow.

Which cars and years does it affect?

Find garages near you and, before you say yes, check whether the quote is reasonable.

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