Have you checked the electrical ground at the light?

I've experienced corrosion at that spot which caused the light to not work. After cleaning off the corrosion, thus restoring a good ground, the lights worked again.

Hope this helps, Dean

Have someone step on the pedal while you watch the light. If you can see when the light comes on, you can bypass the extra person. Press increasingly harder until the light comes on. If the brake light does not come on or if you have to press harder than it takes to stop the car normally, it's a bad switch. I was replacing pressure switches about every year and finally just bit the bullet and switched to a later, lever switch. I had no idea mine was bad until a member told me during a tour that my brake light wasn't working. It came on if I pressed the pedal hard enough to would have had to lock-up the brakes to get it to light.

I have been fighting the brake lights for 2 days or more.  They work for a while and then they don't.  Just rebled the brakes for about the third time, and put in a new switch.  Half way through the brake lights worked, but when we got done, the don't.  What did you have to do to convert to a lever action switch?  I'm assuming you put in one similar to what's on 50 and 60s cars.

Ken

Posted by: @bowtiefan

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I have been fighting the brake lights for 2 days or more.  They work for a while and then they don't.  Just rebled the brakes for about the third time, and put in a new switch.  Half way through the brake lights worked, but when we got done, the don't.  What did you have to do to convert to a lever action switch?  I'm assuming you put in one similar to what's on 50 and 60s cars.

Ken

Screwed it to the bottom side of the floor board and ran jumpers to the wires down by the master cylinder.

I've never seen one like that.  What's it out of and where did you get it? 

Ken

Just went to my FLAPS (Friendly Local Auto Parts Store) and told them I wanted a lever brake light switch for an old Chevy. I can't tell you what year or model it's for. The Filling Station sells them as well.

https://store.fillingstation.com/shop/?year=All&vehtype=All&search=brake+light+switch&searchtype=FT

Thanks, I'll look into that.

Ken

@tiny 

It looks like one part number lever switch was used from 1942 to 1950 on just about every Chevrolet.

A second part number mechanical switch was used from there up to about 1954.

Hope that helps.

I got the earlier one and installed it.  I now have brake lights!  Thanks Tiny.

Ken

Excellent!