SAE J160 (MAY2025)

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Thermal Swell, Growth, and Hot Compressibility of Brake Friction Materials and Noise Insulators

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SAE J160 (MAY2025)

Thermal Swell, Growth, and Hot Compressibility of Brake Friction Materials and Noise Insulators

PUBLISH DATE 2025
SAE J160 (MAY2025)

This document specifies a **universal method** of measuring the thickness change of friction materials to determine the effects of temperature. The test applies to both disc and drum-type linings commonly used in hydraulic and air brake systems for automotive or commercial vehicle applications.

This document describes several methods for thermal swell and growth.

  • Method A is where the friction material is in contact with a heated surface to simulate the heat input to the pad that occurs during actual usage.
  • Method B uses an oven to heat the freestanding material and is an approximate procedure requiring less instrumentation.

Method A is recommended for disc brake pad assemblies, noise insulators, or flat coupons, while Method B is recommended for curved drum brake linings.

This document also describes how to test the warmed-up disc brake pads and noise insulators for hot compressibility using Method A.

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