i cant get my back brakes working,

they are discs

i had the calipers off and put new lines on, bleed it about 4 times now and still nothing

what could it be?

when we bleed fluid comes out and there is no air in them, it goes through a decent amount of fluid so it seems to be flowing quite well,

there is no leaks anywhere

but when you try to use the brakes there is only slight pressure applying the brakes, and there is very little pedal fell until the front brakes start working

two things i can think of, mater cylinder is stuffed in some way???

or when i used the clamp to push the cylinders back the pistons stuck, but then the pedal would be really firm yes?

oh, and maybe there is a kink in the line from the bending that was done, but again i would have strong pedal fell if this was the case i think


what could it be????

im pretty sure im gonna be replacing the master but can anyone think of any other prob i may have???