The picture
Zz-R1100: a strong MOT record by UK norms
Across 950 MOT tests, the Zz-R1100 returns 87.4% first-time pass — comfortably ahead of the UK fleet average. The single most-logged Major fail is a non-functioning shock absorber. Tyre tread under the limit and brake disc or drum excessively weakened round out the top three. Average tested mileage sits at 35,754, which is the lens to read those failure rankings through. If you own one and the next test is close, the ranked list below is a sensible pre-test checklist.
Top ten reasons for rejection.
- 01
A shock absorber not functioning or leaking severely
11 occurrences · 1.2% of tests
- 02
Tyre tread depth not in accordance with the requirements
9 occurrences · 0.9% of tests
- 03
Brake disc or drum excessively weakened, insecure or fractured
7 occurrences · 0.7% of tests
- 04
Significant brake effort recorded with no brake applied indicating a binding brake
7 occurrences · 0.7% of tests
- 05
Significant brake effort recorded with no brake applied indicating a binding brake
7 occurrences · 0.7% of tests
- 06
Excessive fluctuation in brake effort through each wheel revolution
6 occurrences · 0.6% of tests
- 07
A lamp missing or inoperative
6 occurrences · 0.6% of tests
- 08
Brake efficiency below minimum requirement
5 occurrences · 0.5% of tests
- 09
A stop lamp(s) does not illuminate by the operation of both brake controls or remains on when the brakes are released
5 occurrences · 0.5% of tests
- 10
Number plate does not conform to the specified requirements
4 occurrences · 0.4% of tests
Counts cover Major and Dangerous defects logged at test. Advisory items excluded so this shows why a car was rejected, not just what the tester flagged in passing.
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Picked against this car's top failure patterns. Affiliate links to Amazon UK — we earn a small cut at no cost to you. Disclosed up-front, doesn't shape the data.
Buying or keeping a ZZ R1100?
Use the failure ranking as a pre-test checklist or a haggling lever. Treat the headline pass rate as a fleet-wide trend, not a guarantee on any individual car.
If you own a ZZ R1100 and your last MOT looked nothing like the ranked failures above, that's normal — individual cars vary widely. The ranking shows the patterns testers flag most often across the country.