W211 E55 won’t start red brake warning.

[smoothcoupe]

Hi all. My E55 wouldn’t start this morning with reduced brake red warning. Both front and rear batteries were replaced with genuine mb ones 2 weeks ago together with new mb alternator voltage regulator, new mb aux battery relay, and relay upstream fuse. Used to get the red battery warning intermittently even after changing all these but recently it disappeared for the last week. So this morning no starting but battery voltage on my tracker app and across the battery showing 12.8 volts. Even when boot closed won’t open as if a dead battery… any ideas folks. Could it be brake light switch??? And help greatly appreciated. I’ll put on icar soft mb scanner later

 

[PaulG]

Have the red brake errors returned?

 

[smoothcoupe]

Think the problems solved.. I put a new original MB battery from dealer 1 month ago, just checked it now on two different testers, both saying bad cell… so charged my old battery, put it on and it’s all good now.. No malfunctions, for now ..