Dear All,
My ML 270 fail the MOT due to the break lights are not working. It was at the MOT station for the last 7 days they went through the full circuit diagram and the ECU still they couldn't find the fault. Did you come a across this fault or have any solution for this problem. If you could help me I will more appreciates.

Thanks
Champ

Time to start over. Check the bulbs and the fuse(s). If they are good check the switch. If that's good then you get to start tracing and checking wiring.

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Whoever said there's nothing more expensive than a cheap Mercedes never had a cheap Jaguar.

83 300D Turbo with manual conversion, early W126 vented front rotors and H4 headlights 400,xxx miles
08 Suzuki GSX-R600 M4 Slip-on 22,xxx miles
88 Jaguar XJS V12 94,xxx miles. Work in progress.

the tool to use for testing is a multimeter, specifically the voltmeter function of it. is there voltage at the bulb, at the switch, and at the fuse?

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'77 240D, 504H, OM617.952, etc.