Brake servo and vacuum pump Audi: problems by model and engine

Documented faults, from most to least important

Severity × frequency. Below each one, the Audi models it appears in.

- Critical severityFrequency: OccasionalAudi A4 B8Oil in the brake servo through the vacuum hoses (2012 units)Yes, in a 2012 batch: RAPEX alert 37/2014 covers A4, A4 Avant and A4 Allroad (B8) built between March and December 2012 in which, in isolated cases, oil could reach the brake servo through the vacuum hoses and damage its diaphragm, reducing braking force.
- Critical severityFrequency: OccasionalAudi A6 C7Brake servo damaged by oil entering from the vacuum lines (2012 campaign)Safety Gate/RAPEX circulated in September 2014 (alert 37/2014) a recall of the Audi A6 Avant and Allroad (C7) built between March and December 2012: in isolated cases, oil can enter the brake servo through the vacuum hoses, damage the diaphragm and reduce braking force.
- Critical severityFrequency: OccasionalAudi e-tronElectromechanical brake booster failure and corrosion of the brake pressure unit (ABS/ESC)In 2021 Audi recalled two batches of the e-tron because of the electromechanical brake booster (2,303 cars, recall 47R1) and the corrosion of the brake pressure unit (361, recall 47R7). Both can affect the brake booster, the ABS and the ESC and lengthen the braking distance.
- Critical severityFrequency: OccasionalAudi e-tronBolt on the rod between the brake pedal and the brake booster that can work looseAudi first recalled a small batch of 2019 e-trons (recall 46P6) and, in 2026, about 96,000 e-trons and Q8 e-trons worldwide because of the bolted connection of the rod between the brake pedal and the brake booster, which can work loose. It is checked and tightened free of charge.
- High severityFrequency: OccasionalAudi A7 C7Oil in the brake servo from the vacuum hoses (2012 3.0 TDI)Audi recalled A7s built between March and December 2012 (3.0 TDI) because oil could reach the brake servo through the vacuum hoses, damage its diaphragm and reduce brake assistance.
- High severityFrequency: OccasionalAudi Q7 4LOil in the brake servo from the vacuum hoses (3.0 TDI)On the 2012 Q7 4L with the 3.0 TDI engine, Audi issued a recall for possible oil seepage into the brake servo, which damaged its diaphragm and reduced assistance, leaving a hard pedal.
- Critical severityFrequency: RareAudi Q5 ILoss of braking assistance from oil in the brake servo of the Q5 3.0 TDIOn Q5 3.0 TDIs built from March to December 2012, oil may have entered the vacuum lines to the brake servo, damaging its diaphragm and reducing braking assistance. Precautionary campaign cited by Gebrauchtwagenberater.de.

By Audi model

Open yours to see only the faults that affect it, by engine and by year.

Parts for your Audi for faults with the brake servo

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Brake servo
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Frequently asked questions

What faults with the brake servo do Audi cars have?

In 6 models from Audi there are 7 documented faults with the brake servo. The most important: oil in the brake servo through the vacuum hoses (2012 units), brake servo damaged by oil entering from the vacuum lines (2012 campaign) and electromechanical brake booster failure and corrosion of the brake pressure unit (ABS/ESC). Each fault has its own page with the affected years and versions, the symptoms and the repair cost.

Which Audi models have the most problems with the brake servo?

Audi e-tron (2 faults), Audi Q7 4L (1 fault), Audi A4 B8 (1 fault) and Audi Q5 I (1 fault).