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Hello there,Can anybody tell me where I should install a low pressure brake switch at? I am running a Corvette style master mounted below the cab. Disc on front, drums on rear. A 2 lb residual valve for front brakes and a 10 lb for rears. Then behind the rear valve I have an adjustable preportioning valve. I'm thinking it should be installed ahead of any of those inline valves. Can I get some thoughts from anyone? Thanks PS I have a Painless switch part #80174

Yes, the switch should be install before the residual valves. Some switches will tell you not to put them after the valves. Root

Why not try another path. After several pressure switch failures I did. The pressure switch is not really rated to handle the current necessary to run regular brake lights, especially six volts. I went with the mechanical brake light switch made by Lokar. Easy install with no cuting into the brake lines.

Instead of running your lighting load through the the switch, just use the switch to trigger a relay.

I found on my truck, I could stop with a light foot and never turn on the brake lights, so I installed a heavy micro switch to the pedal assembly which turns on the lights as soon as the pedal moves. I have read on the HAMB web site about brake switches and pressures. Seems there are different pressure switches which react to higher or lower pressures. Most thought the low pressure switches worked quicker but don't last very long due to higher pressures required for disk / drum setups. The high pressure switches last longer but take a heavy foot to trigger them. The best way was pedal mounted switches which work with movement. No matter how easy or hard you are on the pedal, the slightest movement activates the lights. I installed two pressure switches on mine before switching over, I thought the first one was bad since I could stop with out activating it.

Joe

A brake light switch for a mid sixties F... product will work fine if you need to activate the brakes light with a hydraulic switch.

I've used them for years on various projects and had very good results.

A Harley Davidson motorcycle pressure switch works well since the lights are activated with very little pressure and they work well with silicone brake fluid becuse that is the fluid installed in Harleys out of the factory. You can pick them up new at any good Harley dealer.

I'll second this....although the H-D switch you will pay for.

Here's a NO pressure switch. You didn't say what year you need it for but if up to 55 you may as well use the original, they work really well.
http://www.oldchevytrucks.com/cart/product.asp?prodid=EL106&i=9766|||||