At a Glance
The Triumph Tr4a has 9 identified common problems across 1 generation, with the TR4A (1965-1967) being the most affected generation and suspension the most common problem category. Based on 10K MOT tests from DVSA data.
Problems are patterns in the DVSA data that occur significantly more often on a specific model than the UK average — confirmed at 99% statistical confidence. Read our DVSA MOT data methodology →
Below: generation-by-generation comparison of Triumph Tr4a common problems, MOT failure types, and pass-rate data drawn from DVSA records. Click any generation to see fuel- and engine-specific fault patterns, mileage-banded repair guidance, and the most common MOT failures testers record.
MOT Tests & Failures by Generation
Triumph Tr4a generations by MOT tests, failures, and identified problems from DVSA data
Hover over each bar for a full breakdown. Tap any bar to view that generation's problems.
Showing total MOT tests, failures, and known problems per make. Hover over each bar for a full breakdown.
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Help other Triumph Tr4a owners — report a problem and we'll add it to the database
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Browse Triumph Tr4a Generations
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Most Common Triumph Tr4a MOT Failures
Every reason Triumph Tr4a vehicles fail their MOT, ranked by frequency. Select an individual year to see only that year’s failures, or stay on ‘All time’ for the combined picture across our 20 years of DVSA data. Scroll inside the table for the full list.
| # | Failure | % of failures |
|---|---|---|
| 1 | Stop lamp not working | 7.67% |
| 2 | Brake performance below minimum | 5.58% |
| 3 | Number plate lamp not working | 5.43% |
| 4 | Suspension joint or bush worn | 5.21% |
| 5 | Track rod end worn | 4.02% |
| 6 | Suspension mounting corroded | 3.81% |
| 7 | Front suspension fault | 3.59% |
| 8 | Brake hydraulic component worn | 3.46% |
| 9 | Front lamp not working | 3.31% |
| 10 | Exhaust system fault | 2.71% |
| 11 | Windscreen washer not working | 2.68% |
| 12 | Shock absorber worn or leaking | 2.59% |
| 13 | Steering column fault | 2.56% |
| 14 | Rear lamp not working | 2.37% |
| 15 | Body corrosion or damage | 2.25% |
| 16 | Chassis condition | 2.21% |
| 17 | Tyre condition | 2.03% |
| 18 | Front suspension joint worn | 1.97% |
| 19 | Parking brake condition | 1.97% |
| 20 | Parking brake performance below minimum | 1.84% |
| 21 | Rear suspension fault | 1.81% |
| 22 | Indicator fault | 1.75% |
| 23 | Tyre tread depth below limit | 1.65% |
| 24 | Horn not working | 1.56% |
| 25 | Steering coupling worn | 1.47% |
| 26 | Steering rack fault | 1.40% |
| 27 | Headlamp aim defect | 1.40% |
| 28 | Wiper blades deteriorated | 1.37% |
| 29 | Headlamp fault | 1.15% |
| 30 | Position lamp not working | 1.12% |
| 31 | Fuel pipe corroded or damaged | 1.00% |
| 32 | Steering free play excessive | 0.84% |
| 33 | Steering operation fault | 0.84% |
| 34 | Brake pedal fault | 0.78% |
| 35 | Brake fluid leak | 0.72% |
| 36 | Steering shaft fault | 0.69% |
| 37 | Brake pedal movement restricted | 0.62% |
| 38 | Steering wheel damaged or insecure | 0.59% |
| 39 | Steering lock fault | 0.56% |
| 40 | Brake disc or drum worn | 0.53% |
| 41 | Driveshaft fault | 0.53% |
| 42 | Seat belt condition | 0.53% |
| 43 | Ball joint dust cover split | 0.53% |
| 44 | Battery loose or leaking | 0.50% |
| 45 | Steering arm worn | 0.50% |
| 46 | Suspension retaining or locking device fault | 0.47% |
| 47 | Brake pads or linings worn | 0.37% |
| 48 | Coil spring broken or corroded | 0.37% |
| 49 | Wheel bearing worn | 0.37% |
| 50 | Fuel cap damaged or missing | 0.31% |
| 51 | Fuel hose damaged or leaking | 0.31% |
| 52 | Steering lock stop fault | 0.31% |
| 53 | Subframe mounting corroded | 0.31% |
| 54 | Windscreen damage affecting view | 0.31% |
| 55 | Electrical switch fault | 0.28% |
| 56 | Speedometer fault | 0.28% |
| 57 | Brake caliper fault | 0.25% |
| 58 | Mirror damaged or missing | 0.25% |
| 59 | Handbrake cable fault | 0.22% |
| 60 | King pin or swivel pin worn | 0.22% |
| 61 | Driver seat fault | 0.19% |
| 62 | Electrical wiring fault | 0.19% |
| 63 | Engine oil leak | 0.19% |
| 64 | Rigid brake pipe corroded or damaged | 0.19% |
| 65 | Body security fault | 0.16% |
| 66 | Brake lever fault | 0.16% |
| 67 | Drag link end worn | 0.16% |
| 68 | Universal joint worn | 0.16% |
| 69 | Suspension linkage fault | 0.16% |
| 70 | Indicator warning light fault | 0.12% |
| 71 | Suspension arm worn or corroded | 0.12% |
| 72 | Tyre valve stem damaged | 0.12% |
| 73 | Brake master cylinder or servo mounting fault | 0.09% |
| 74 | Driver door fault | 0.09% |
| 75 | Leaf spring broken or corroded | 0.09% |
| 76 | Spark ignition emissions above threshold | 0.09% |
| 77 | Vehicle structure corrosion | 0.09% |
| 78 | Bonnet catch or hinge fault | 0.06% |
| 79 | Boot lid damaged or insecure | 0.06% |
| 80 | Brake cable, rod, lever or linkage fault | 0.06% |
| 81 | Brake wheel cylinder fault | 0.06% |
| 82 | Engine mounting worn or broken | 0.06% |
| 83 | Exhaust leak | 0.06% |
| 84 | Flexible brake hose damaged | 0.06% |
| 85 | Fuel tank corroded or leaking | 0.06% |
| 86 | Main beam warning light fault | 0.06% |
| 87 | Passenger seat fault | 0.06% |
| 88 | Spring mounting corroded | 0.06% |
| 89 | Steering box fault | 0.06% |
| 90 | Bonded suspension condition | 0.06% |
| 91 | Anti-roll bar worn or corroded | 0.03% |
| 92 | Brake back plate corroded or damaged | 0.03% |
| 93 | Brake clevis joint worn | 0.03% |
| 94 | Brake fluid warning light on | 0.03% |
| 95 | Brake pedal linkage fault | 0.03% |
| 96 | Brake servo fault | 0.03% |
| 97 | Dashboard warning lamp fault | 0.03% |
| 98 | Front passenger door fault | 0.03% |
| 99 | Propshaft fault | 0.03% |
| 100 | Subframe corrosion or damage | 0.03% |
| 101 | Trailing arm worn or corroded | 0.03% |
| 102 | Transmission oil leak | 0.03% |
| 103 | Tyre size or type not matched | 0.03% |
| 104 | Wheel hub fault | 0.03% |
| 105 | Towbar fault | 0.03% |
Showing all 105 reasons — scroll inside the table for the full list.
Triumph Tr4a MOT Failures by Category
Total MOT failure occurrences for the Triumph Tr4a, grouped by category. Same data as the failures table above — just sliced by category instead of fault title. Hover a slice for the top failures in each category.
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Frequently Asked Questions
What are the most common Triumph Tr4a problems?
Based on analysis of 10K Triumph Tr4a MOT tests from DVSA data, we have 9 identified common problems across 1 generation. The most frequently flagged issue is "Brake performance below minimum". Suspension is the most common problem category.
Which Triumph Tr4a generation has the most problems?
The Triumph Tr4a TR4A (1965-1967) (1965–1967) has the highest number of identified common problems (12). Click the generation card above for the full breakdown.
How is this data calculated?
We analyse anonymised DVSA MOT test records under the Open Government Licence. An issue is classified as a "Common Problem" when it occurs significantly more often on a specific model than the UK average, confirmed at 99% statistical confidence. Read the full methodology page for details.
Can I report a problem with my Triumph Tr4a?
Yes — use the "Tell Us About Your Problem" form on this page. Your report helps other Triumph Tr4a owners spot problems early. All submissions are reviewed before being added to the public database.
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