My daily driver (1984 300D) had a leak into the interior from corrosion behind the battery. This led to the passenger rear foot well having a rust hole which I discovered by pulling up the carpet one day.

The entire seam between the floor and the rocker panel up to the front wheel well decided to rust out as well. I managed to park the car for a few days and weld in some new metal and new rubberized undercoating, but just finished it enough to get the car back on the road.

Fast forward to a year later I find the driver's rear floor carpet soaked. I dry it out, no rust to be seen. A month following that I notice that my right foot is cold and the pedal seems soft. Check underneath the car and the pedal mounting tab has rusted through the bottom of the car.

While I'm trying to find a place to store the care while I fix it, I'm driving long distance on business and the driver's seat leans a bit too far in one corner. Yup. The right rear seat mount has also rusted through the floor.

Time to fix it all.

So here's the damage.

The pedal pulled out of the body without any force. I just detached it from the linkage rod. (Yes, that is undercoating on the bottom)

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Once I removed the driver's seat, carpeting and chiseled away the asphalt sound insulation. This is what I found.



And after the partially rusted out seat channel was removed.

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I recondition w123/w126/w124/w140/r107/r129/ steering boxes!


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