Showing specs for all NA & NB Miatas

Rear brake disc thickness — minimum (NA6)

Minimum: 0.28 in (7.0 mm)Minimum: 7.0 mm (0.28 in)

Factory manualTaken from a Mazda factory workshop manual, with page citation.
Procedure

Minimum service thickness for original NA6 brake hardware; does not apply to a later brake conversion and is not an after-machining specification.

Applies to
  • NA 1990–1993 (B6) — Other years inferred from 1990 factory evidence.
  • Verified in: 1990 Mazda MX-5 Miata Workshop Manual