That is probably your brake wear warning light. This is for the front brakes, at least it is on my car. I agree that there may be something loose if you're only getting the light when hitting bumps. Check the front brake pads.
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1999 MB SL500 (110,000 mi)
2004 Volvo V70 2.5T (220,000 mi)
2014 Tesla Model S 85 (136,000 mi)
MBCA member
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