# Proportioning bypass valve bolts (non-ABS) (NB2)

Canonical URL: https://miatatorque.com/spec/brake-proportioning-bypass-valve-bolts-nb2/

Applicability: NB 2001–2005 (BP-Z3, non-ABS); NB 2004–2005 (BP-Z3-TURBO, non-ABS)

Confidence: fsm

70–104 in·lb / 7.9–11.7 N·m

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": "brake-proportioning-bypass-valve-bolts-nb2",
  "name": "Proportioning bypass valve bolts (non-ABS) (NB2)",
  "aliases": [
    "proportioning valve",
    "brake line",
    "brake pipe"
  ],
  "applies_to": [
    {
      "gen": "NB",
      "years": [
        2001,
        2005
      ],
      "engines": [
        "BP-Z3"
      ],
      "abs": false
    },
    {
      "gen": "NB",
      "years": [
        2004,
        2005
      ],
      "engines": [
        "BP-Z3-TURBO"
      ],
      "abs": false
    }
  ],
  "kind": "torque",
  "torque": {
    "nm": [
      7.9,
      11.7
    ],
    "kgfcm": [
      80,
      120
    ],
    "inlb": [
      70,
      104
    ]
  },
  "procedure": {
    "notes": "The manual's procedure covers both cars: proportioning bypass valve (without ABS) or brake pipe joint (with ABS). Same torque for both."
  },
  "confidence": "fsm",
  "sources": [
    {
      "source": "fsm-2005",
      "page": "PDF p. 1313",
      "as_printed": "7.9—11.7 {80—120, 70—104}\nN·m {kgf·cm, in·lbf}",
      "torque": {
        "nm": [
          7.9,
          11.7
        ],
        "kgfcm": [
          80,
          120
        ],
        "inlb": [
          70,
          104
        ]
      },
      "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"
            ]
          }
        ]
      }
    },
    {
      "source": "mitchell1-2005-brakes",
      "page": "PDF p. 32",
      "as_printed": "7.9—11.7 {80—120, 70—104}\nN·m {kgf·cm, in·lbf}",
      "torque": {
        "nm": [
          7.9,
          11.7
        ],
        "kgfcm": [
          80,
          120
        ],
        "inlb": [
          70,
          104
        ]
      },
      "note": "Reproduces the same Mazda diagram as the factory citation; this is an additional lookup location, not independent evidence. Numeric claims checked against the reproduced diagram.",
      "document": {
        "id": "mitchell1-2005-brakes",
        "tier": 2,
        "title": "Mitchell1 2005 MX-5 Miata: brakes",
        "covers": [
          {
            "gen": "NB",
            "years": [
              2005,
              2005
            ]
          }
        ],
        "url": "https://www.mellens.net/mazda/Mazda-Miata-2005/brakes.pdf",
        "note": "Secondary service printout. Some articles cover multiple Mazda models or years; citations use only the identified Miata entries. Other Mitchell1 printouts count as the same publisher, not independent consensus."
      }
    }
  ],
  "jobs": [],
  "system": "brakes",
  "component": "brake-hydraulics",
  "componentName": "Brake lines & master cylinder",
  "url": "https://miatatorque.com/spec/brake-proportioning-bypass-valve-bolts-nb2/"
}
```