The Ford Barn

Bazooka Joe · 03-10-2026, 02:33 PM

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What is involved when replacing the stop light switch on a 40 Ford besides just unscrewing it. As guessing brake fluid will come out of the master cylinder ?

I found a used spare Borg-Warner S193 stop light switch ( has additional casing numbers on the switch, 97265 and 06 in another area ) in the trunk of the car.

Does anyone know if the S193 is a compatible replacement, as it seems to look the same?

Does anybody know how much PSI pressure is needed to close the switch, as I have nitrogen and should be able to hook it up to test.

Thank You

Joe

03-10-2026, 02:33 PM	#1
Bazooka Joe Senior Member Join Date: Dec 2013 Location: Connecticut/Florida Posts: 123	1940 Ford Stop Light Switch Sponsored Links (Register now to hide all advertisements) What is involved when replacing the stop light switch on a 40 Ford besides just unscrewing it. As guessing brake fluid will come out of the master cylinder ? I found a used spare Borg-Warner S193 stop light switch ( has additional casing numbers on the switch, 97265 and 06 in another area ) in the trunk of the car. Does anyone know if the S193 is a compatible replacement, as it seems to look the same? Does anybody know how much PSI pressure is needed to close the switch, as I have nitrogen and should be able to hook it up to test. Thank You Joe