Thread: Brake Light switch

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Hi all. I'm wiring my '46 Ford (American Auto wire kit) and was wondering if I can use a 2lb in-line brake light switch/and where to install it. i have 4/whl disc brakes and a proportioning valve. Should it be before or after the valve. Many thanks.

I don't think it will make any difference. Pressure should be equal through out the system unless you have a proportioning valve to reduce pressure to the rear brakes. In my opinion, you should install a mechanical switch and toss the hydraulic switch in the garbage can..

carquest has a electrical book that has many switchs in it if you can get a look at one . i have used the in line PRESSURE switch but i had two fail on one build. so they used a lever switch .so you may want to look at the mechanical lever or the buttom if you can keep out of weather if under the floor board then i would use a lever switch

This pic is a little fuzzy, but this is the brake line layout on my chassis as installed by TCI. Hope it helps.

Mike

Here are a couple of better pics showing the switch in the rear brake circuit just after leaving the master cylinder.

Mike

I agree with Paul, I have a pressure switch on my roadster, and I have replaced it many, many times. The bad thing is you never know when it goes out, you just don't have brake lights!, not a good thing. Edd

The switch is ok where it is (before the proportioning valve), but I still recommend the mechanical switch. It does not have to be in the front brake lines.