Brake pedal, hoses and brake fluid 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 B5Brake pedal retaining bolt that can work loose (1998-1999 campaign)The British DVSA recorded in January 1999 a recall of 9,192 Audi A4s built between July 1994 and August 1995: the bolt holding the brake pedal could work loose and leave the pedal on the floor without returning, with loss of braking control. The bolt was checked and tightened.
- 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.
- Critical severityFrequency: OccasionalAudi e-tronOvertightened bolts on the brake hoses of the Q8 e-tron (2023-2024)In 2024 Audi recalled 284 Q8 e-trons and Q8 e-tron Sportbacks built between May 2023 and March 2024 because overtightened bolts on the brake hoses can break, causing a brake fluid leak and the failure of one circuit.
- Critical severityFrequency: OccasionalAudi Q5 IIBrake master cylinder leak and rear pistons that do not work properly (2018-2019 campaigns)Between 2018 and 2019, Audi recalled production batches of the Q5 II for a possible brake fluid leak in the master cylinder and, in a separate campaign, for rear brake pistons that might not work correctly.Repair: €0
- Critical severityFrequency: RareAudi A3 IVRisk of total loss of braking power (11 cars)In September 2021, Audi recalled 11 A3 cars built between August 2020 and May 2021 because a faulty component could cause total loss of braking power.Repair: €0

By Audi model

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

Frequently asked questions

What faults with the brake system do Audi cars have?

In 4 models from Audi there are 5 documented faults with the brake system. The most important: brake pedal retaining bolt that can work loose (1998-1999 campaign), bolt on the rod between the brake pedal and the brake booster that can work loose and overtightened bolts on the brake hoses of the Q8 e-tron (2023-2024). 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 system?

Audi e-tron (2 faults), Audi A4 B5 (1 fault), Audi Q5 II (1 fault) and Audi A3 IV (1 fault).