Does the Mercedes-Benz B-Class fail the MOT on brakes more than it should?
The Mercedes-Benz B-Class records 9.76 brakes failure items per 100 initial MOT tests (2019–2024), against 10.48 expected for a car of the same age mix: less than expected for its class and age (−0.72, 95% interval −0.82 to −0.62). It ranks 372 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 Mercedes-Benz B-Class by registration
What exactly fails on brakes?
The most frequent DVSA defect wording in this group on the Mercedes-Benz B-Class is “Brake pipe damaged or excessively corroded”, recorded 8,147 times in 2019–2024.
| DVSA defect wording | Items | Per 100 tests |
|---|---|---|
| Brake pipe damaged or excessively corroded | 8,147 | 2.08 |
| a brake lining or pad worn below 1.5mm | 7,162 | 1.83 |
| Parking brake efficiency below minimum requirement | 3,745 | 0.96 |
| Service brake efficiency below minimum requirement | 1,968 | 0.50 |
| Brake disc or drum significantly and obviously worn | 1,911 | 0.49 |
Source: DVSA MOT bulk data (OGL v3.0) · Window: 2019–2024 · n = 391,293 (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 Mercedes-Benz B-Class gets a brakes advisory, how often does it fail next time?
12.6% of Mercedes-Benz B-Class MOTs with a brakes advisory were followed by a fail in the same group at the next MOT, typically 12 months and 5,108 miles later (61,033 advisories followed).
Source: DVSA MOT bulk data (OGL v3.0) · Window: 2019–2024 · n = 61,033 (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
Mercedes-Benz B-Class 2005 · Mercedes-Benz B-Class 2006 · Mercedes-Benz B-Class 2007 · Mercedes-Benz B-Class 2008 · Mercedes-Benz B-Class 2009 · Mercedes-Benz B-Class 2010 · Mercedes-Benz B-Class 2011 · Mercedes-Benz B-Class 2012 · Mercedes-Benz B-Class 2013 · Mercedes-Benz B-Class 2014 · Mercedes-Benz B-Class 2015 · Mercedes-Benz B-Class 2016 · Mercedes-Benz B-Class 2017 · Mercedes-Benz B-Class 2018 · Mercedes-Benz B-Class 2019 · Mercedes-Benz B-Class 2020 · Mercedes-Benz B-Class in Norway · Mercedes-Benz B-Class in Finland · Mercedes-Benz B-Class in the Netherlands · Mercedes-Benz B-Class by postcode area · Mercedes-Benz B-Class body, chassis and structure failures · Mercedes-Benz B-Class vehicle identification failures · Mercedes-Benz B-Class lamps, reflectors and electrics failures · Mercedes-Benz B-Class noise, emissions and leaks failures · Mercedes-Benz B-Class road wheels failures · Mercedes-Benz B-Class seat belts and airbags failures · Mercedes-Benz B-Class steering failures · Mercedes-Benz B-Class suspension failures · Mercedes-Benz B-Class tyres failures · Mercedes-Benz B-Class visibility failures