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

Documented faults, from most to least important

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

- Critical severityFrequency: OccasionalBMW iX3 G08Faulty hydraulic brake unit: reduced braking assistance and ABS unavailableIn April 2021 Safety Gate alert A12/00590/21 included the iX3 built up to 1 February 2021 (3,840 vehicles across several BMW models): a faulty hydraulic unit of the brake system can reduce braking assistance and lengthen the braking distance; in those cases the ABS is not available.
- Critical severityFrequency: OccasionalBMW Serie 2 Active Tourer U06Defective weld on the hollow shaft of the brake servo (brake system servomotor)In 2025 BMW recalled several models, including the 2 Series with type U2AT (Safety Gate alert SR/00053/25), because the hollow shaft of the brake servomotor could be poorly welded and could break under high pressure. In the United Kingdom, the DVSA counts only 3 Active Tourers built between March 2023 and July 2024.
- Critical severityFrequency: OccasionalBMW X1 U11Faulty weld on the hollow shaft of the brake servo (brake system servo motor)In 2025 BMW recalled, with a Safety Gate alert, X1 and iX1 models (and others) built between July 2022 and November 2024 because the hollow shaft of the brake servo motor could be badly welded and break under high braking pressure: the pedal would need more force, braking distances would grow and ABS and DSC would lose assistance.
- Critical severityFrequency: OccasionalBMW X5 G05Loss of brake assistance due to integrated braking system (IBS) faultBMW has recalled cars built since June 2022, the X5 among them, because the integrated braking system can unexpectedly lose its hydraulic assistance: you have to press the pedal harder, stopping distances get longer and the ABS and stability control may fail. In 2021 there was another campaign over the hydraulic unit of that system.
- Critical severityFrequency: OccasionalBMW X5 G05Faulty weld on the hollow shaft of the brake boosterIn January 2025 the Safety Gate published a BMW recall over the brake booster: its hollow shaft is not properly welded and the weld may give way under high brake pressure. It affects cars built between July 2022 and November 2024 (X5, X6 and X7 included), lengthens stopping distances and leaves the ABS and DSC without assistance.
- Critical severityFrequency: OccasionalBMW X6 G06Loss of brake assistance due to integrated braking system (IBS) faultBMW has recalled cars built since June 2022, the X6 among them, because the integrated braking system can unexpectedly lose its hydraulic assistance: you have to press the pedal harder, stopping distances get longer and the ABS and stability control may fail. In 2021 there was another campaign over the hydraulic unit of that system.
- Critical severityFrequency: OccasionalBMW X6 G06Faulty weld on the hollow shaft of the brake boosterIn January 2025 the Safety Gate published a BMW recall over the brake booster: its hollow shaft is not properly welded and the weld may give way under high brake pressure. It affects cars built between July 2022 and November 2024 (X5, X6 and X7 included), lengthens stopping distances and leaves the ABS and DSC without assistance.
- Critical severityFrequency: OccasionalBMW X7 G07Loss of brake assistance due to integrated braking system (IBS) faultBMW has recalled cars built since June 2022, the X7 among them, because the integrated braking system can unexpectedly lose its hydraulic assistance: you have to press the pedal harder, stopping distances get longer and the ABS and stability control may fail. In 2021 there was another campaign over the hydraulic unit of that system.
- Critical severityFrequency: OccasionalBMW X7 G07Faulty weld on the hollow shaft of the brake boosterIn January 2025 the Safety Gate published a BMW recall over the brake booster: its hollow shaft is not properly welded and the weld may give way under high brake pressure. It affects cars built between July 2022 and November 2024 (X5, X6 and X7 included), lengthens stopping distances and leaves the ABS and DSC without assistance.
- Critical severityFrequency: RareBMW Serie 1 F40Campaign for possible loss of brake assistance (position sensor, 2022 production)Yes: BMW recalled 1 Series F40 units built between 9 June and 2 September 2022 because an erroneous signal from the engine position sensor can cause the hydraulic brake assistance to be lost.
- Critical severityFrequency: RareBMW Serie 5 E60Soft brake pedal due to a fault in the brake servo vacuum pump or hoseBMW recalled around 5,000 5 Series E60s in March 2016 because a fault in the vacuum pump (diesel) or the brake servo vacuum hose leaves the brake pedal soft with the engine running, according to fiches-auto.fr.
- Critical severityFrequency: RareBMW Serie 6 E63/E64Brake servo oilGebrauchtwagenberater records a KBA recall for oil that can enter the brake servo of cars built from 2004 to 2010 and reduce braking assistance.
- Critical severityFrequency: RareBMW X3 F25Brake servo failure due to insufficient lubrication of the vacuum pump (production from June 2012 to August 2013)Yes: according to Gebrauchtwagenberater.de, F25s built between June 2012 and August 2013 were recalled because insufficient lubrication of the vacuum pump could leave the brake servo inoperative; the usual warning is a hard brake pedal.
- Critical severityFrequency: RareBMW X5 E70Oil in the brake servo damages the diaphragm and removes assistance (built 2006-2010)Yes: according to Gebrauchtwagenberater.de, BMW recalled X5s built from 2006 to 2010 because engine oil could enter the brake servo, damage its diaphragm and cause loss of brake assistance.

By BMW model

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Parts for your BMW 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 BMW cars have?

In 11 models from BMW there are 14 documented faults with the brake servo. The most important: faulty hydraulic brake unit: reduced braking assistance and ABS unavailable, defective weld on the hollow shaft of the brake servo (brake system servomotor) and faulty weld on the hollow shaft of the brake servo (brake system servo motor). Each fault has its own page with the affected years and versions, the symptoms and the repair cost.

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

BMW X5 G05 (2 faults), BMW X7 G07 (2 faults), BMW X6 G06 (2 faults) and BMW Serie 5 E60 (1 fault).