Abs system activate every time it use brakes and no abs light is on.

Hello, have you had diagnostic testing performed using a diagnostic tool that can detect chassis related codes -- codes that start with a "C"? This will give you clues on where to look. For example, if you have a code for left front speed sensor out of range, and you've already replaced the sensor -- have you checked the wiring and connector? Have you checked the tone ring that the sensor reads? Testing is key and tracing down the concern and monitoring sensor data is essential to getting to the source of the problem.