How Many ABS Sensors Need to Be Replaced If They Fail in a Mercedes-Benz?
2 Answers
Mercedes-Benz ABS sensors should be replaced on a one-to-one basis if they fail. However, before replacement, the sensor should be inspected first, as excessive dirt can also affect the signal. Methods to prevent ABS sensor damage: Maintain sufficient braking distance: When driving on good road surfaces, ensure at least a three-second braking distance from the vehicle ahead. On poor road surfaces, a longer braking distance is required. Keep the sensors clean: ABS wheel sensors and toothed rings are installed on each wheel, so it is essential to regularly clean the sensor probes and toothed rings. Prevent mud, oil, and especially magnetic materials from adhering to their surfaces, as these can cause sensor failure or send incorrect signals to the ABS control unit, affecting the normal operation of the ABS system. Pay attention to brake fluid usage: The ABS system has very high requirements for brake fluid. Therefore, adding or replacing brake fluid must strictly follow the vehicle's user manual instructions, and mixing different types of brake fluid is prohibited.
As a car enthusiast, I have studied the Mercedes-Benz ABS system. Typically, there are four ABS sensors on a Mercedes, one for each wheel. If a sensor fails, it doesn't necessarily mean all need replacement. First, use an OBD diagnostic tool to check the fault code and identify which wheel is affected. Often, only one sensor is faulty, so just that one needs replacing. However, if the vehicle is old or the sensors are generally aged, it's advisable to replace all of them to ensure system coordination. Causes of ABS sensor failure include dirt blockage, wiring damage, or corrosion. Replacement requires professional tools to remove the hub and clean the interface. After installation, the system needs to be reset and tested. Ignoring this issue may lead to brake failure, constant ABS warning light, and compromised driving safety. It's best to have the work done at an authorized service center to avoid DIY mistakes.
