16 year old son had to have a 1988 4x4 Toyota. It has a five inch lift. The brakes were crap, so sent it to a recommended mechanic and brakes are still crap. It is like they wont bleed. They go to the floor and zero back brakes. Mechanic says due to modified lift.

I shut the truck down. Been sitting for two years. Now he is 18 and he is adamant about driving it. Wants to drive it to a friend's garage and fix it?! Momma Bear is feeling uneasy. So any suggestions or verdicts of why only near nothing front brakes (goes to the floor and barely any brake) and zero back brakes?