Does the Porsche 911 fail the MOT on brakes more than it should?
The Porsche 911 records 4.01 brakes failure items per 100 initial MOT tests (2019–2024), against 17.27 expected for a car of the same age mix: less than expected for its class and age (−13.26, 95% interval −13.41 to −13.10). It ranks 691 of 712 models on brakes (1 = most failures above expected).
Data release dvsa-2024-v2 (24 Sep 2026) · page updated 30 Sep 2026 · all models on brakes · check a Porsche 911 by registration
What exactly fails on brakes?
The most frequent DVSA defect wording in this group on the Porsche 911 is “Brake pipe damaged or excessively corroded”, recorded 4,180 times in 2019–2024.
| DVSA defect wording | Items | Per 100 tests |
|---|---|---|
| Brake pipe damaged or excessively corroded | 4,180 | 1.46 |
| Parking brake efficiency below minimum requirement | 952 | 0.33 |
| Significant brake effort recorded with no brake applied indicating a binding brake | 593 | 0.21 |
| Brake disc or drum significantly and obviously worn | 563 | 0.20 |
| Leaking brake pipe or connection on a hydraulic system | 480 | 0.17 |
Source: DVSA MOT bulk data (OGL v3.0) · Window: 2019–2024 · n = 285,717 (initial tests) · Method: failure items (major and minor) grouped by DVSA's defect tree; wordings with 30+ items · Updated: 30 Sep 2026 · Release: dvsa-2024-v2 · CSV
If a Porsche 911 gets a brakes advisory, how often does it fail next time?
6.7% of Porsche 911 MOTs with a brakes advisory were followed by a fail in the same group at the next MOT, typically 12.2 months and 1,376 miles later (26,367 advisories followed).
Source: DVSA MOT bulk data (OGL v3.0) · Window: 2019–2024 · n = 26,367 (advisories followed) · Method: the same vehicles followed to their next ordinary MOT · Updated: 30 Sep 2026 · Release: dvsa-2024-v2 · CSV
Other pages for this model
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