# Front brake disc runout — maximum (NB1)

Canonical URL: https://miatatorque.com/spec/front-brake-disc-runout-limit-nb1/

Applicability: NB 1999–2000 (BP-4W) — Other years inferred from 1999 factory evidence.

Confidence: fsm

0.05 mm {0.002 in} maximum

Always confirm against your factory manual. Match every restriction and follow all stages and procedure notes. Disputed claims must not be automatically resolved. The complete record below preserves every printed unit, source claim and procedure.

```json
{
  "id": "front-brake-disc-runout-limit-nb1",
  "name": "Front brake disc runout — maximum (NB1)",
  "aliases": [],
  "applies_to": [
    {
      "gen": "NB",
      "years": [
        1999,
        2000
      ],
      "engines": [
        "BP-4W"
      ],
      "note": "Other years inferred from 1999 factory evidence."
    }
  ],
  "kind": "non-torque",
  "value_text": "0.05 mm {0.002 in} maximum",
  "procedure": {
    "notes": "Secure disc to hub using two wheel nuts. Measure at outer edge of disc surface."
  },
  "confidence": "fsm",
  "sources": [
    {
      "source": "fsm-1999",
      "page": "04–11–13 (PDF p. 398)",
      "as_printed": "Runout limit\n0.05 mm {0.002 in} max.",
      "verified_years": [
        1999,
        1999
      ],
      "document": {
        "id": "fsm-1999",
        "tier": 1,
        "title": "1999 Mazda MX-5 Miata Workshop Manual",
        "covers": [
          {
            "gen": "NB",
            "years": [
              1999,
              2000
            ],
            "engines": [
              "BP-4W"
            ]
          }
        ],
        "url": "https://www.mellens.net/mazda/Mazda-Miata-1999-2001.pdf"
      }
    }
  ],
  "jobs": [],
  "system": "brakes",
  "component": "inventory-pass-2026-10",
  "componentName": "Service measurements and fasteners",
  "sequence_diagrams": [],
  "url": "https://miatatorque.com/spec/front-brake-disc-runout-limit-nb1/"
}
```