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Labor Day Putting down your wrenches or time for
MORE wrenching? 
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Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
Lots of work on Brad's part ... pure enjoyment (and references) for you!
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| | | | Joined: Aug 2006 Posts: 129 Shop Shark | | Shop Shark Joined: Aug 2006 Posts: 129 | Is the stop light switch different on the larger '39-46 1-1/2 Ton Trucks? I am working on a 1940 WB 1-1/2 Ton and it does not have a pressure operated switch on the master cylinder like the pickups. What do they use or has someone changed this truck? | | | | | Joined: Sep 2006 Posts: 1,997 Big Bolt Forum Co-moderator | | Big Bolt Forum Co-moderator Joined: Sep 2006 Posts: 1,997 | On an AD it is actuated by the brake pedal. Look on the firewall and see if there is a switch with an arm that gets pushed down by the brake pedal. If there isn't one there, see if there are two small holes for mounting a switch. Someone who knows a lot more than me should be posting soon.
A day without laughter is a day wasted- Charlie Chaplin
When wrestling a grizzly bear, you have to keep at it until the bear gets tired, not when you get tired. 1948 Chevy 2-Ton | | | | | Joined: Jul 2011 Posts: 26 New Guy | | New Guy Joined: Jul 2011 Posts: 26 | Check to see if on the firewall under the brake pedal (engine side) if there are to bolt holes. I have a 41 and it uses a swing arm style. It is wired so when the pedal is up, the switch is closed.
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