ISO 27667:2011

Overview - ISO 27667:2011 (Brake lining friction materials & corrosion)

ISO 27667:2011 specifies laboratory methods and assessment criteria for evaluating corrosion effects on painted backing plates (disc brakes) and painted brake shoes (drum brakes). It is intended for the product specification/validation phases and for series production monitoring in conjunction with ISO 15484, and covers only laboratory performance tests (static or cyclic). Field exposure, proving-ground protocols and prediction of in-service life are explicitly out of scope.

Key topics and technical requirements

• Scope and purpose
  • Defines test selection, sampling and assessment criteria for painted backing plates and brake shoes used with friction materials.
  • Emphasizes harmonized reporting of corrosion phenomena observed during and at completion of laboratory tests.
• Core test methods
  • Salt spray/fog testing per ISO 9227 (neutral salt spray - NSS). Typical parameters referenced: cabinet temperature ~35 °C, NaCl ≈ 50 g/l, pH 6.5–7.2 and a range of exposure durations (short to extended cycles).
  • Resistance to liquids per ISO 2812‑1 (immersion, absorbent discs, spotting). Candidate liquids include lubricating oil and brake fluid (e.g., 48 h immersion examples).
• Evaluation procedures
  • Adhesion testing using ISO 2409 (cross‑cut).
  • Coating degradation and defect rating using ISO 4628 series (quantity/size of defects, blistering, rusting, cracking).
• Pre-test definitions
  • Agree on test procedures, sampling plan, duration/number of cycles, expected failure modes and assessment criteria with the customer before testing.
• Reporting requirements
  • Test report must identify the product, reference ISO 27667, list methods and any deviations, include results, start/completion dates, digital images and reference/control sample reports.

Practical applications and users

Who uses ISO 27667:2011:

• Brake component manufacturers (pads, shoes, backing plates)
• Automotive OEMs and suppliers validating brake system components
• Coating and paint system suppliers for brakes
• Independent test laboratories and QA/validation engineers
• Materials and corrosion engineers assessing protective coatings

Typical applications:

• Product specification and validation of painted brake components
• Comparative laboratory evaluation of paint/coating systems (quality control)
• Series production monitoring when paired with ISO 15484
• Supporting selection of paint/binder systems and assessing resistance to moisture, fog, oils and brake fluids

Note: ISO 27667 encourages using artificial‑aging and laboratory tests together with field data where feasible, since laboratory acceleration does not always replicate natural exposure.

Related standards

• ISO 9227 (salt spray tests)
• ISO 2812‑1 (resistance to liquids)
• ISO 2409 (cross‑cut adhesion)
• ISO 4628‑1 to ‑4 (coating degradation/rating)
• ISO 15484 (product definition and quality assurance for brake lining friction materials)

Keywords: ISO 27667:2011, brake lining friction materials, painted backing plates, brake shoes, corrosion testing, ISO 9227, ISO 2812-1, coating evaluation, automotive brake validation.