The picture
Cb: a strong MOT record by UK norms
Across 8,636 MOT tests, the Cb returns 91.1% first-time pass — comfortably ahead of the UK fleet average. The single most-logged Major fail is tyre tread under the limit. A non-functioning shock absorber and brake pads worn below 1.0 mm round out the top three. Average tested mileage sits at 14,447, 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
Tyre tread depth not in accordance with the requirements
104 occurrences · 1.2% of tests
- 02
A shock absorber not functioning or leaking severely
67 occurrences · 0.8% of tests
- 03
Brake lining or pad worn below 1.0mm
59 occurrences · 0.7% of tests
- 04
Excessive fluctuation in brake effort through each wheel revolution
38 occurrences · 0.4% of tests
- 05
A transmission belt, chain, sprocket or pulley excessively loose or worn
28 occurrences · 0.3% of tests
- 06
Significant brake effort recorded with no brake applied indicating a binding brake
23 occurrences · 0.3% of tests
- 07
A wheel bearing with excessive play
22 occurrences · 0.3% of tests
- 08
Number plate does not conform to the specified requirements
18 occurrences · 0.2% of tests
- 09
A footrest missing or insecure
18 occurrences · 0.2% of tests
- 10
Reflector missing or reflecting white to the rear
16 occurrences · 0.2% 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.
Worst-case fix budget · top 2 failures
£140–£255
If every one of this CB's most-logged Major fails hit at the same MOT, that's the real-world UK garage range. Reality is usually one or two items, not all of them. Open the estimator →
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Build your own retest budget.
Tools that pre-empt a retest.
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.
Item 01 · Amazon UK
Digital tyre-tread depth gauge
Five quid for a gauge beats £150 for a retest. UK MOT minimum is 1.6mm — most testers fail anything below 2mm to be safe.
Search Amazon UK
Item 02 · Amazon UK
Brake pad measurement gauge
Testers fail pads under 1.5mm. A wear gauge tells you if you've got two months left or two weeks.
Search Amazon UK
Buying or keeping a CB?
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 CB 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.