Does the Porsche 928 fail the MOT on brakes more than it should?
The Porsche 928 records 9.62 brakes failure items per 100 initial MOT tests (2019–2024), against 20.27 expected for a car of the same age mix: less than expected for its class and age (−10.65, 95% interval −11.90 to −9.40). It ranks 662 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 928 by registration
What exactly fails on brakes?
The most frequent DVSA defect wording in this group on the Porsche 928 is “A brake hose ferrule excessively corroded”, recorded 62 times in 2019–2024.
| DVSA defect wording | Items | Per 100 tests |
|---|---|---|
| A brake hose ferrule excessively corroded | 62 | 1.24 |
| Significant brake effort recorded with no brake applied indicating a binding brake | 61 | 1.22 |
| Parking brake efficiency below minimum requirement | 47 | 0.94 |
| Warning device shows system malfunction | 37 | 0.74 |
| Service brake efficiency below minimum requirement | 34 | 0.68 |
Source: DVSA MOT bulk data (OGL v3.0) · Window: 2019–2024 · n = 5,000 (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
Other pages for this model
Porsche 928 by postcode area · Porsche 928 body, chassis and structure failures · Porsche 928 vehicle identification failures · Porsche 928 lamps, reflectors and electrics failures · Porsche 928 noise, emissions and leaks failures · Porsche 928 seat belts and airbags failures · Porsche 928 steering failures · Porsche 928 suspension failures · Porsche 928 tyres failures · Porsche 928 visibility failures