I had the 190E taken for an oil change at the local shop. While that was being done I noticed the brake fluid was a bit low. So I had the mechanic top it off. However I noticed that the fluid he used was wagner DOT 3.
I know the benz is supposed to have DOT 4, my question is will that hurt the braking system ? Should I have it flushed just because there's a bit of DOT3 in the system mixed with DOT4 ?

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Whether you think you can or cannot, Either way you're right!. by Henry Ford.

I'd vote no.
The fluids are compatible.
DOT4 has better properties in terms of moisture absorbtion and boiling point.

OTOH, if you have not flushed in the past year, a flush is a good idea anyways. I confess I often go 2 years between flushes, or whenever my brake pads wear out.

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1986 300E 5-Speed 240k mi.

Ditto, don't worry about it.

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95 E320 Cabriolet, 159K

phew !
thanks for the replies. makes me feel better now otherwise I was getting worried about it.

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Whether you think you can or cannot, Either way you're right!. by Henry Ford.