How has she been able to drive it for the last month with the red message flashing? I thought, when that happened, virtually all braking power was lost.

How many miles on the car?

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14 E250 Bluetec 4Matic "Sinclair", Palladium Silver on Black, 159k miles
06 E320 CDI "Rutherford", Black on Tan, 179k mi, Stage 1 tune, tuned TCU
91 300D "Otis", Smoke Silver on Tan, 145k mi, wastegate conversion, ALDA delete

19 Honda CR-V EX 77k mi
Fourteen other MB's owned and sold
1961 Very Tolerant Wife

I don't know. Maybe it was a warning message but it was red and said something about brakes. It was different than the casual "Visit brake workshop " message that was there when i was driving it.

She said she heard a pop and then the brakes went completely out and she had to use the parking brake to stop. I'm just glad no one was hurt. She just got to the dealer so i'll keep you all posted ....

I hope this thread helps anyone to not be stupid like my wife was and to not drive the car except maybe to the dealer if they see a red brake warning on their car with an SBC module.

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What Would Rudolph Do?
1975 300D, 1975 240D, 1985 300SD, 1997 300D, 2005 E320 , 2006 Toyota Prius