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It may have an internal short or a leak where it lost all water. You may also have a short 8n the vehicle that is draining the battery. Make sure all lights are off when car is off. I had a bad brake light switch that caused my brake lights to stay on and that drained my battery overnight. I didn't notice it when parking during the day.
Several MB models have had tail light recalls due to bulb socket issues and overheating wire connections. It's also possible that the wrong replacement bulbs were inserted at some point. If you mean the back-up (reverse) lights are staying on, that could be due to faulty wiring or a defective backup switch on the transmission gear selector.
If the tail lamps are staying on, that means the parking lights are on including the front, right ?
That could be the headlight switch.
If the brake lights are staying on, that could be the brake switch.
If you have amber signal lights & red brake lights, it's 2 separate circuits. You'll need to buy a small converter that you wire into harness to correct that. Not expensive, try autoparts store or RV/trailer sales, should have them.
The master cylinder has failed, the fluid bypasses from one cylinder to the other, this is really 2 cylinders in one, the brake system is split in an X pattern.
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