ISO 26867:2009

Overview - ISO 26867:2009 (brake lining friction materials)

ISO 26867:2009 specifies an inertia-dynamometer test procedure for assessing the friction behaviour of brake lining materials in combination with a specific mating component (disc or drum). The standard quantifies how pressure, temperature and linear speed affect the coefficient of friction, using brake temperature as the control variable during fade sequences to ensure repeatable temperature increments across different dynamometer cooling systems. It is intended for material comparison, specification control and development or production verification.

Key topics and technical requirements

• Test scope and setup: inertia-dynamometer configuration, vehicle-representative inertia, test wheel load and rotor/drum conditions.
• Controlled variables: applied pressure, brake temperature (control item for fade sections), linear speed and deceleration.
• Environmental control: cooling air speed/flow, ambient temperature and humidity conditioning for repeatable results.
• Data acquisition: sampling rate, torque and pressure recording, instantaneous friction statistics and average-by-distance calculations.
• Test procedures: burnish, constant-pressure/constant-deceleration and fade sections; options for additional brake applications for product development.
• Reporting and analysis: graphical summaries, tabular data, wear measurements, histograms of instantaneous friction, and statistical analysis suitable for integration with Statistical Process Control (SPC).
• Supportive annexes: vehicle/test parameters, sample reports for disc brakes, histogram methods, and reference calculations for cooling air speed/flow.

Practical applications and users

ISO 26867:2009 is used by:

• Brake material formulators and manufacturers for product development and benchmarking.
• Automotive OEMs and tier suppliers to validate friction behaviour for a given vehicle platform.
• Test laboratories and QA teams for production verification and quality assurance using SPC.
• Applications and process engineers evaluating real-world-like brake applications beyond simple drag tests.

Typical uses include comparative material screening, production monitoring, product development (including additional tailored brake applications), and forensic analysis of field braking issues. The standard complements vehicle-level regulations and stopping-distance tests rather than replacing them.

Related standards and references

• ISO 15484 - Brake linings: product definition and assurance
• ISO 611:2003 - Braking vocabulary for road vehicles
• ECE Regulation 13‑H - Braking approval provisions for passenger cars
• Also used in conjunction with FMVSS (e.g., FMVSS 105/135) and industry test programs (SAE, JASO) where applicable.

Keywords: ISO 26867:2009, brake lining friction materials, friction behaviour assessment, automotive brake systems, dynamometer test, coefficient of friction, fade testing, production verification.