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I have also got the ABS and ETS lights coming on as soon as I press the brake pedal, and no brake lights on my 2001 ML55.
I checked the brake light switch, both sets of contacts seemed good, but replaced it with a new MB switch anyway - no change.
I have swapped relay K25 over with each of the others around it .... and checked that there is 12V on both sides of the ABS motor fuse.
I am now trying to remove the plug on the back of the ABS module, to check the power cables there. I can lift up the housing of the connector about 1,5 cm, but then it stops and won't go any higher .... and I can't see any clips holding it back, and can't find any other way to pull this connector off :-(
What is the trick here ??
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