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?