Triumph Mk 4 1300 vs Triumph Unknown: reliability comparison
MOT pass rates, common faults and mileage compared from real UK MOT data.
Triumph Mk 4 1300
89%
MOT pass rate · 1 vehicles
Triumph Unknown
89%
MOT pass rate · 65,927 vehicles
Verdict: On MOT pass rate the Triumph Mk 4 1300 (89%) and Triumph Unknown (89%) are very close — weigh the individual measures below, and remember condition depends on age, mileage and upkeep.
Head to head
| Measure | Triumph Mk 4 1300 | Triumph Unknown |
|---|---|---|
| MOT pass rate | 89% | 89% |
| MOT failure rate | 11% | 11% |
| Faults & advisories per test | 0.7 | 0.6 ✓ |
| Dangerous-fault share | 0% ✓ | 2% |
| Average mileage | 30,293 mi | 16,601 mi |
| Sample size (vehicles) | 1 | 65,927 |
Most common faults
Triumph Mk 4 1300
- nearside floor panel slightly corroded but not with in 30cm of load bearing member
- Body has slight corrosion (6.1.B.2)
- Brake hose slightly deteriorated (3.6.B.4d)
- Nearside Front Suspension component mounting prescribed area is excessively corroded (2.4.A.3)
- rear brake application uneven (3.7.B.2)
- Brakes imbalanced across an axle (3.7.B.5b)
Triumph Unknown
- Exhaust noisy (8.1.1 (a))
- Exhaust noisy (7.1.2)
- Front Roller brake test indicates slight fluctuation of brake effort (3.3.A1d)
- COVID-19 6 MONTH EXTENSION
- Rear Tyre worn close to the legal limit (5.2.3 (e))
- Steering headbearing has slight free play (2.2.2)
Reliability FAQ
On MOT pass rate the Triumph Mk 4 1300 (89%) and Triumph Unknown (89%) are very close — weigh the individual measures below, and remember condition depends on age, mileage and upkeep.
Full Triumph Mk 4 1300 report Full Triumph Unknown report Most reliable cars
Pass rates are computed over completed (pass/fail) MOT tests. Reliability also depends on age, mileage and upkeep — see each model's page for the full picture.