Sometimes I have brake lights and sometimes not so much brake lights. All tail and blinker lights work all of the time so I am pretty sure it's not a bad ground or the like. Seems that when I apply the brake pedal and no pressure has been built up they work fine but after I step on them once and the pressure increases no stop lights. I was wondering if maybe I should just try to replace the pressure switch? As I understand it, there is a pressure diverter (or something) and I wondered if that might cause or add to the trouble. Thanks for any input. MM :?