# Front brake disc thickness variation limit

Canonical URL: https://miatatorque.com/spec/front-brake-disc-thickness-variation-limit-nb2/

Applicability: NB 2001–2005 (BP-Z3) — Other years in this family inferred from 2005 factory evidence with owner approval; actual-year verification is separate.; NB 2004–2005 (BP-Z3-TURBO, 6MT) — Common 2005 front-brake inspection covers both rotor sizes. Diameter-specific limits apply only to the rotor diameter named in the record; 2004 is inferred.

Confidence: fsm

0.015 mm (0.00059 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-thickness-variation-limit-nb2",
  "name": "Front brake disc thickness variation limit",
  "aliases": [],
  "applies_to": [
    {
      "gen": "NB",
      "years": [
        2001,
        2005
      ],
      "engines": [
        "BP-Z3"
      ],
      "note": "Other years in this family inferred from 2005 factory evidence with owner approval; actual-year verification is separate."
    },
    {
      "gen": "NB",
      "years": [
        2004,
        2005
      ],
      "engines": [
        "BP-Z3-TURBO"
      ],
      "trans": [
        "6MT"
      ],
      "note": "Common 2005 front-brake inspection covers both rotor sizes. Diameter-specific limits apply only to the rotor diameter named in the record; 2004 is inferred."
    }
  ],
  "kind": "non-torque",
  "value_text": "0.015 mm (0.00059 in), maximum",
  "procedure": {
    "notes": "Clean the friction surface, measure the factory circumferential points and subtract minimum thickness from maximum. Preserve the applicable rotor minimum when machining."
  },
  "confidence": "fsm",
  "sources": [
    {
      "source": "fsm-2005",
      "page": "PDF p. 1282",
      "as_printed": "Thickness variation limit\n0.015 mm {0.00059 in}",
      "verified_years": [
        2005,
        2005
      ],
      "document": {
        "id": "fsm-2005",
        "tier": 1,
        "title": "2005 Mazda MX-5 Miata Workshop Manual (electronic manual capture)",
        "covers": [
          {
            "gen": "NB",
            "years": [
              2005,
              2005
            ],
            "engines": [
              "BP-Z3"
            ]
          },
          {
            "gen": "NB",
            "years": [
              2005,
              2005
            ],
            "engines": [
              "BP-Z3-TURBO"
            ],
            "trans": [
              "6MT"
            ]
          }
        ]
      }
    }
  ],
  "jobs": [],
  "system": "brakes",
  "component": "gap-followup-2026-10",
  "componentName": "Additional factory manual gap audit",
  "sequence_diagrams": [],
  "url": "https://miatatorque.com/spec/front-brake-disc-thickness-variation-limit-nb2/"
}
```