mixturegro Posted October 18 Share Posted October 18 The 2003 S430 operates and drives well. Several weeks ago, a brake light illuminated on the dashboard. Upon inspection, I discovered the fluid level was low, so I replenished it, and everything seemed to be functioning well. A few days later, I saw the signal on the dashboard again, despite the fluid level being at the full mark. I was aware that it need brakes, so I purchased them; a post on this is available here. Upon replacing the brakes, I discovered that this vehicle is equipped with sensors alone on the passenger side, despite the package including three sensors. Regardless, I fitted the brakes, and now within 10 miles of each drive, the brake light reactivates, accompanied by more faults. I have purchased a Xentry system, but it will not arrive until the end of the month. Do you have any recommendations on what I should seek out? Link to comment Share on other sites More sharing options...
mixturegro Posted October 18 Author Share Posted October 18 Link to comment Share on other sites More sharing options...
partexpat Posted October 18 Share Posted October 18 Have you replaced all three brake sensors? Two sensors are positioned at the front left and front right, while one sensor is located in the back. Link to comment Share on other sites More sharing options...
thinkaboo Posted October 18 Share Posted October 18 Is it not the indicator for your parking brake? Link to comment Share on other sites More sharing options...
mixturegro Posted October 18 Author Share Posted October 18 We changed two sensors, both located on the right side. There was none on either the front or rear left side. I own two more sensors, but I am unable to locate the appropriate connection point. The light illuminates when the parking brake is engaged. In this scenario, the brake light will glow while driving if the brake is removed, thereby resulting in mistakes. Link to comment Share on other sites More sharing options...
surveyunlawful Posted October 18 Share Posted October 18 There is no rear left, but there should be a front left. Two electrical lines should be connected to the knuckle: one for the speed sensor and the other for the braking sensor. There exists a third wire connected to the Airmatic strut and a fourth cable linked to the Airmatic height sensor. Absence of the brake sensor cable indicates a problem. If you own it, you only need to install the sensor, precisely the inverse of the one on the right. Link to comment Share on other sites More sharing options...
five5nuclear Posted October 18 Share Posted October 18 That is the indicator for your parking brake. Link to comment Share on other sites More sharing options...
mixturegro Posted October 18 Author Share Posted October 18 I do not using the parking brake. What is the reason for it activating when in motion? What should I verify? Link to comment Share on other sites More sharing options...
boastfuleager Posted October 18 Share Posted October 18 A parking brake sensor exists. However, I have observed that the warning light activates in the presence of other braking issues as well. It serves as both a "parking brake engaged" and a "brake system malfunction" warning indicator. Link to comment Share on other sites More sharing options...
mixturegro Posted October 18 Author Share Posted October 18 We have come to the realization that we did not bleed the system after the replacement of the rotors and pads. I will get a bleeder kit and attend to it promptly. What is the connection point for the pad sensor? I possess two sensors that I can deploy, contingent upon my knowledge of their optimal placement and installation method. Link to comment Share on other sites More sharing options...
abovePleasant Posted October 18 Share Posted October 18 Wouldn't the braking sensors activate a separate indicator light? Â Link to comment Share on other sites More sharing options...
partexpat Posted October 18 Share Posted October 18 This is not a brake pad wear problem, since the braking sensor would contact the rotor, causing a short circuit in the two little wires, which would activate the brake warning light when the brake pads are worn. If the issue pertains to the Parking Brake switch, the dashboard display will illuminate red as the vehicle begins to move. Consider inspecting the brake sensors and connections for metal filings that may induce a short circuit. The vehicle's computer identifies the source of the malfunction but is unable to communicate this via a solitary Brake warning light. A Safety Data Sheet (SDS) may analyze the issue and identify its source. Link to comment Share on other sites More sharing options...
mixturegro Posted October 18 Author Share Posted October 18 I own the Autel AP200; however, it has ceased functioning, prompting me to acquire a Mercedes Xentry configuration, which is expected to arrive next week. I will examine its contents. Link to comment Share on other sites More sharing options...
partexpat Posted October 18 Share Posted October 18 Even with the absence of the left front brake sensor, it should not trigger the brake warning light. Unless there is uniform wear on both the left and right sides, a warning will not be triggered if just the left front brake exhibits early wear, suggesting potential issues with the caliper, pads, or rotor. Kindly check the brake sensors and their connections for any dirt or metal debris. Link to comment Share on other sites More sharing options...
mixturegro Posted October 18 Author Share Posted October 18 The rotors and pads are about one week old. I substituted them, believing they would resolve this issue. This weekend, I will examine the front brakes to check the sensor is mounted. Link to comment Share on other sites More sharing options...
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