ok i have good brake pressure w/ the truck off but when i strat the truck the pressure drops alot. brake booster? also tried bleeding the brakes no fluid at rear drivers side wheel?

 

welcome
I have to assume the master cylinder is full of fluid? Are you getting fluid to the passenger rear? Maybe its a bad master cylinder. A bit more information about the problem would help.

 

yes, res is full, bleed the mc, the lsvp, the drivers side rear but no fluid. took the blleder out it was clogged so i cleaned it reinsatalled it tried again still no fluid. very lil fluid at the pass. side. front bleeds good

 

Have you made sure one of the rear wheel cylinders is not oozing a ton of fluid? Do you have good fluid at Lsvp?

 

no fluid oozing, good @ the lsvp.

 

Maybe 1 of two things. Could be insufficient pressure generated by master cylinder or clog in the LSVP or lines splitting to wheel cylinders. Maybe someone else might have some other ideas.