brake system question
 

just replaced the steel brake lines running to the back of my 1989 toyota pickup i think i might be loosing vacume from somewhere because my brake engage when they're almost on the floor but when i pump them up they engage almost right when you step on em, but as soon as i take off an i go to hit them again they go to the floor, there are no leaks coming from any of the brake lines an the vacume hose is connected i was wondering if there is anything else that could be causeing this problem that i havent thought about.

rear brake shoe adjustment
bleed the LSPV

x2... sounds like rear brakes out of adjustment.

is the lspv the bleeder that sits off of the drum on the frame? in the ass end