A brake disc advisory means wear has been noted but the disc is not significantly and obviously worn. A significantly worn disc is a major defect; one that is insecure, fractured or likely to fail is dangerous. Being below the maker's limit alone is not a fail.
Checked 23 October 2026 against the DVSA MOT inspection manual
- Significantly worn: Major defect
- Fractured or likely to fail: Dangerous defect
- Below maker's limit only: Not a fail
- DVSA manual: 1.1.14
What this advisory means
An advisory is recorded when an item is not deteriorated enough to justify a fail, so the note informs the presenter of the condition found. Advisories do not cause a fail and are recorded in the MOT history. The note therefore signals that a brake disc was worn, pitted or scored at the time of test but did not meet the threshold for a defect that fails the vehicle.
The DVSA manual lists a brake disc or drum that is significantly and obviously worn as a major defect under 1.1.14 a i. A disc that is insecure, fractured or likely to fail is dangerous under 1.1.14 a ii. Being below the manufacturer's recommended wear limit is not on its own a reason to fail, and the manual has no separate entry for scored or pitted discs.
The advisory therefore sits below the major defect threshold. It records a condition that falls short of significant and obvious wear and does not involve insecurity, fracture or likelihood of failure. The note keeps the presenter informed without affecting the test result, and it remains part of the vehicle's MOT history for future reference.
When it becomes an MOT fail
A brake disc or drum that is significantly and obviously worn becomes a major defect under DVSA manual reference 1.1.14 a i. This is the point at which an advisory recorded at a previous test turns into a fail. The wording turns on visible, substantial wear rather than a measured figure, so the condition must be clear on inspection. Being below the manufacturer's recommended wear limit is not on its own a reason to fail, which is why a disc can remain an advisory even when a maker's figure has been passed.
A disc that is insecure, fractured or likely to fail is classed as dangerous under reference 1.1.14 a ii. This is the most serious outcome and means the vehicle must not be driven on the road until the defect is rectified. The distinction between major and dangerous rests on whether the disc could fail imminently. A significantly worn disc is a major defect, while one assessed as likely to fail moves into the dangerous category.
The manual contains no separate entry for scored or pitted discs. The presence of scoring or pitting alone does not convert the advisory into a major or dangerous defect under the current manual.
| DVSA manual ref | Defect | Result |
|---|---|---|
| 1.1.14 (a)(i) | Disc or drum significantly and obviously worn | Major |
| 1.1.14 (a)(ii) | Disc or drum insecure, fractured or likely to fail | Dangerous |
| 1.1.14 (b) | Contaminated with oil, grease etc. | Major |
Source: DVSA manual section 1: brakes, checked 23 October 2026.
Frequently asked questions
What does an MOT advisory for a worn, pitted or scored brake disc mean?
An advisory is used when an item is not deteriorated enough to justify a fail, to inform the presenter. It does not cause a fail and is recorded in the MOT history.
Does an advisory for brake discs mean the vehicle has failed its MOT?
No. Advisories do not cause a fail. The item is recorded to inform the presenter, and the result stands as a pass with the advisory noted in the MOT history.
When does a worn brake disc become a major defect rather than an advisory?
A brake disc or drum that is significantly and obviously worn is a major defect under DVSA manual 1.1.14 a i. A disc that is insecure, fractured or likely to fail is dangerous under 1.1.14 a ii.
Is a disc below the manufacturer's wear limit an automatic MOT fail?
No. Being below the manufacturer's recommended wear limit is not on its own a reason to fail. The decision rests on whether the disc is significantly and obviously worn or otherwise defective.
Why is there no separate MOT entry for scored or pitted brake discs?
The DVSA manual has no separate entry for scored or pitted discs. Such findings are handled under the general brake disc and drum defects, or noted as an advisory where deterioration does not justify a fail.
