Brake Light Switch

[karlatteberry]

I have a 1969 F250 and am having difficulty with my brake switch. The problem is, while the truck is running and I apply the brakes, the pedal does not fully return, and if I don't toe under it to lift it, my brake lights remain on - or flicker. I don't think there is a return spring? Any suggestions on how to get the pedal to fully return? when the engine is off - it returns better - which makes me wonder if its a booster/vacuum issue?

Thanks in advance!!
Karl

[ultraranger]

Checks you can do to determine if the booster is working correctly.

http://www.mbmbrakeboosters.com/index.p ... &Itemid=15