MOT failures by make
Daihatsu MOT failures for “Rigid brake pipes: excessively corroded”
Daihatsu cars failed their MOT on “Rigid brake pipes: excessively corroded” in 2.65% of 35,812 tests in 2023–2024 (948 tests) — 1.6 times as often as comparable cars of the same age, mileage and fuel, which would have failed on it in about 1.63% of tests. It is the number 7 most common failure item on Daihatsus.
Data to 2024-12-30 · Page updated 2026-09-28 · Publisher: 73 Auto
- Daihatsu tests failing on it
- 2.65%
- 948 of 35,812 tests, 2023–2024
- Comparable cars
- 1.63%
- national rate at the same age, mileage and fuel
- Observed ÷ expected
- 1.62×
- 73 Auto analysis · rank #7 for Daihatsu
How unusual this is for the make
Across all MOT failures, Daihatsus fail 1.00× as often as comparable cars. On this item the gap is 1.62× wider than that overall level, so it is a genuine Daihatsu pattern rather than a reflection of how often the make fails in general. It is a major defect in the brakes part of the test. Nationally it appears on 0.66% of MOT tests.
Daihatsu models and “Rigid brake pipes: excessively corroded”
One Daihatsu model has enough tests to compare. Not every model follows the make: the pattern is concentrated in some models. Model rows compare with cars of the same age and fuel.
| Model | Tests | Failed on it | vs similar cars |
|---|---|---|---|
| Daihatsu Sirion | 13,036 | 2.92% | 1.75× |
By age at test
The difference is largest at 13-15 years old: 2.69% of Daihatsu tests against 1.18% for comparable cars.
| Age (years) | Daihatsu tests | Daihatsu | Comparable cars |
|---|---|---|---|
| 13-15 | 10,731 | 2.69% | 1.18% |
| 16+ | 24,774 | 2.65% | 1.84% |
Other Daihatsu MOT faults that stand out
- Component mounting prescribed areas: prescribed area excessively corroded significantly reducing structural strength · 2.93× comparable cars
- Ball joint: ball joint excessively worn · 2.86× comparable cars
- Prescribed areas: prescribed area strength or continuity significantly reduced · 2.95× comparable cars
Limitations
Official data: DVSA's anonymised MOT results (2023–2024), class 4 initial tests, cars at least 2.5 years old. 73 Auto analysis: the comparison rate applies the national rate of this item for each test's own age, mileage band and fuel to the Daihatsu tests. An MOT result reflects maintenance, mileage and how a car is used as well as its design, so this is not a measure of which make is most reliable. The wording of the defect is DVSA's.
Has this Daihatsu failed on it before?
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UK number plate or 17-character VIN
Where these figures come from
- Anonymised MOT tests and results (2023 and 2024) — Driver and Vehicle Standards Agency (DVSA). Open Government Licence v3.0.
Figures labelled as 73 Auto estimates are our own analysis of these sources, set out in the methodology and data sources. To report a factual error, see corrections.