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Black Deposits on Brake Light Switch Plunger
This jpg I got off another forum and is typical of what one will see when one opens up the removed brake light switch. The black powder is residue from arcing of one of the pair of contacts within.

Hopefully the newer switches with the FOMOCO logo moulded into the plastic are improved from the Land Rover logo marked early units, however I doubt it.

The Ford part number is SW-6572 and/or 7E5Z-13480-A as used on the 2006 to 2009 Ford Fusion's and Mercury Milan's; the Land Rover part number is XKB500110. Cost of switch could be about twenty five dollars. A previous LR part number for the switch was XKB500030, so hopefully the newer LR part number, XKB500110, reflects some improvement in reliability.

It is possible that the new switches are better as I installed a replacement 72,000 km, (45,000 miles) later, at 195,000 km (121,000 miles). When I took the removed switch apart to inspect, it was clean inside. There was no black dust - the switch looked like new, hence they must be improved now.
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