The coefficient of friction (mu, µ) describes how much friction force a lining generates against a disc or drum for a given clamping force. In simple terms, it heavily influences braking torque. If µ is lower than expected, the brake may not hold a load or stop within required limits. If µ is higher, braking may become abrupt, causing shock loading, vibration, or structural stress—especially in lifting and positioning equipment.
In real industrial use, µ is not a single fixed number. It changes with temperature, speed, surface condition, wear, and contamination. That’s why stable friction behavior across operating conditions is often more important than peak friction.
When selecting or replacing friction materials, match the brake’s designed µ range. An “almost similar” aftermarket lining can be unsafe because small µ changes can produce large torque differences. OEM linings are formulated and validated to deliver predictable torque, thermal behavior, and wear rates consistent with the brake design and certification requirements.
