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Is the abs sensor on back tire or front tire?

The ABS (anti-lock brake system) sensors are usually located on each wheel. So, there will be ABS sensors on both the front and back tires. These sensors monitor the speed of rotation of each wheel and relay this information to the ABS control module. When a wheel starts to lock up, the ABS module modulates the brake pressure to that wheel, allowing it to continue rotating and preventing it from skidding.