Otto - The brake light switch is located on the underside of the cab floor kick panel, pretty much directly under the steering column. Screenshots below are the switch info from the Shop Manual and a screengrab of a Denny Graham posted picture of his 1950 Chevy pickup engine compartment showing the actual switch and location.

Since the switch and wire connections are exposed to the elements, the switch and/or the wire connections do fail overtime. Repop switches are available from our usual vendors. wink

EDIT NOTE: It is a mechanical arm movement electric switch that is triggered by depressing the brake pedal. The brake pedal rod actual move the switch arm between the off/on positions. I've added a pic of the switch by itself from Jim Carters EL106 ad page.
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Last edited by Gdads51; 10/06/2026 1:37 PM.
~ Dan
1951 Chevy 3 window 3100
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"My Grandpa Carl's Truck and How it Became Mine"
1966 Chevelle (Wife's Hot Rod) | 2013 Chevy Silverado (Current daily driver)
US Army MSG Retired (1977-1998) | Com Fac Maint Lead Tech Retired (1998-2021)