Quote Originally Posted by Dave Severson View Post
What psi is required to close the switch and turn on the brake lights??? Could be a low pressure switch, like you'd use for an oil pressure light, and the residual pressure as mentioned by 34_40 is closing the switch.......

PS--Please don't ask how I learned this!!!!!!!!!!!!!!!!!!!!!!
It takes a touch of pressure to turn it on. I tested it that way to see how sensitive it was. The switch is 'correct' for a 1965 Rambler American, which I know from having owned 1, the switch is right under the master cylinder in it's own port.. However, the switch is a stock item at my local carquest so it may double as an oil light sender.