1985 Morgan 4/4 — MOT failures & pass rate
The 1985 Morgan 4/4 passed 84.4% of its 263 recorded MOT tests. All cars of a similar age fail 20.0% of the time, so this is 4.4pp better than the group it competes with. Failures cluster in brakes, lighting & signalling and emissions & environmental.
What the MOT record shows
No single area dominates — brakes (10.3%) and lighting & signalling (8.8%) are close, so failures are spread across several systems rather than one weak point.
At component level the recurring items are service brake imbalance, position lamp and service brake performance — service brake imbalance alone was recorded 21 times.
A 60-90k example is materially riskier than a 0-30k one: 20.5% versus 4.8%.
Suspension is the most common advisory, noted on 14.4% of tests — work that passed today but is likely due soon.
The trend is worsening — 13.7% of tests failed in 2021 against 16.3% in 2025, the usual pattern as a fleet ages.
How it compares
Top failure categories
| # | Category | % of tests affected | Tests |
|---|---|---|---|
| 1 | Brakes | 10.3% | 27 |
| 2 | Lighting & signalling | 8.8% | 23 |
| 3 | Emissions & environmental | 2.7% | 7 |
| 4 | Visibility | 2.3% | 6 |
| 5 | Suspension | 2.3% | 6 |
| 6 | Steering | 1.5% | 4 |
Most common specific failures
The exact components most often recorded as failures — more specific than the categories above.
| # | Failure item | Times recorded |
|---|---|---|
| 1 | Service brake imbalance | 21 |
| 2 | Position lamp | 11 |
| 3 | Service brake performance | 8 |
| 4 | Rear fog lamp | 6 |
| 5 | Wipers | 6 |
| 6 | Headlamp | 5 |
Top advisory categories
Advisories aren't failures, but they flag work likely needed soon — useful when budgeting.
| # | Category | % of tests with advisory | Tests |
|---|---|---|---|
| 1 | Suspension | 14.4% | 38 |
| 2 | Emissions & environmental | 9.1% | 24 |
| 3 | Brakes | 7.6% | 20 |
| 4 | Body, structure & corrosion | 7.6% | 20 |
| 5 | Visibility | 3.4% | 9 |
| 6 | Tyres | 3.4% | 9 |
Failure rate by mileage
Higher-mileage cars tend to fail more — often the most useful guide to real condition.
| Mileage band | Tests | Fail rate |
|---|---|---|
| 0-30k | 63 | 4.8% |
| 30-60k | 110 | 18.2% |
| 60-90k | 83 | 20.5% |
Trend over time
| Dataset year | Tests | Fail rate |
|---|---|---|
| 2021 | 51 | 13.7% |
| 2022 | 64 | 18.8% |
| 2023 | 46 | 8.7% |
| 2024 | 53 | 18.9% |
| 2025 | 49 | 16.3% |
What to check before buying a 1985 4/4
The failure pattern for this year is specific enough to inspect against: brakes accounted for 10.3% of tests. Start there.
- Brakes (10.3% of tests): Pads/discs are routine wear; binding, imbalance or corroded pipes are more serious — test for pulling under braking. Typical repair: £100–£350 per axle.
- Lighting & signalling (8.8% of tests): Often a cheap bulb, but persistent issues can mean wiring or corrosion in the units. Typical repair: £10–£150.
- Emissions & environmental (2.7% of tests): More common on older diesels (DPF/EGR) — can be expensive; check for warning lights and smoke. Typical repair: £100–£600.
Repair costs are rough UK ballpark ranges to set expectations, not quotes — actual prices vary widely by car, parts and garage.
Frequently asked questions
How many 1985 Morgan 4/4s pass their MOT?
84.4% of the 263 1985 Morgan 4/4 MOT tests in this dataset passed — a 15.6% fail rate.
What is the most common MOT failure on a 1985 Morgan 4/4?
Brakes, recorded in 10.3% of tests, followed by lighting & signalling (8.8%).
Does the 1985 4/4 get worse with mileage?
Its MOT fail rate rises from 4.8% in the 0-30k band to 20.5% in the 60-90k band.
Methodology & source. Based on 263 MOT tests. Dataset: DVSA MOT testing data (2021,2022,2023,2024,2025). Data last updated 2026-07-27. Figures reflect MOT-testable defects only — read the methodology for how these are calculated and what they don't measure.