# With any external crack or cracks that open upon brake application (do not confuse short hairline heat check cracks with flexural cracks) — Vehicle inspection defect categories: MOT major, minor and dangerous verdicts

For With any external crack or cracks that open upon brake application (do not confuse short hairline heat check cracks with flexural cracks), category is Reject; inspection item number is 1; defect reference is c.(1); inspection item is Brake System; authority is US 49 CFR Appendix A to Part 396, recorded from its source on 2026-08-06.

- **Defect:** With any external crack or cracks that open upon brake application (do not confuse short hairline heat check cracks with flexural cracks) _(verified: appears in the quote below)_
- **Category:** Reject
- **Inspection item number:** 1 _(verified: appears in the quote below)_
- **Defect reference:** c.(1)
- **Inspection item:** Brake System
- **Authority:** US 49 CFR Appendix A to Part 396 _(our reading, not quoted from the source)_

## What the source says

> c. Brake Drums or Rotors. (1) With any external crack or cracks that open upon brake application (do not confuse short hairline heat check cracks with flexural cracks).

## Source

- https://www.law.cornell.edu/cfr/text/49/appendix-A_to_part_396

Last verified: 2026-08-06. Review by: 2027-02-02.
Part of [Vehicle inspection defect categories: MOT major, minor and dangerous verdicts](https://referencesource.org/vehicle-inspection-defect-categories/).