Nothing personal/no disrespect Jam- but if you're unsure of how brake systems works/functions, you will be better off having someone come out & diagnose this for you. A brake system is not a place you want to try things by trial & error. Your lift weighs in exscess of 8000 lbs empty- around 12000 lbs fully loaded. If you service the brakes, the worst time to find out you did something wrong is when you can't stop.

I would STRONGLY suggest you buy a book on automotive brake systems & get familiar with the parts/theories that make the system work before you hurt yourself/others or damage something. I have seen many accidents/injuries from such a undertaking- trying to fix something which you don't understand how it operates.