At 02:48 PM 7/3/2010 Saturday, neil n wrote:
>installed ~4 years ago. Would an improperly adjusted push rod (on
>booster) affect amount of pedal pressure needed to turn brake lights
>on?
>
>What else would could be at fault here? Design flaw?

Neil, they're pressure switches.  They haven't a clue that you're
moving the pedal, but they know when the brakes start to push back on
the hydraulic fluid, and that's when they switch.  If they're not
switching on reliably by the time the first perceptible braking
occurs, they're bad.  If they're switching on *before* the brakes
actually engage, you've got stuck calipers or some other mechanical issue.

Yours,
David