ABS, BAS warning lights are on

2000 CLK Cabriolet
Press on the brake pedal and the ABS, BAS, & ESP lights come on. The brake lights work fine.
When the car is first started the warning lights are off again until the
brake is depressed.
Is there another switch on the brake pedal that is at fault?
Thanks
Mike
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Only one switch. The "second" switch is internal. Pop a new Brake light switch in. Should rectify your problem.

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