that sounds like a sh-it kit. keep bleeding them lines off the master, sounds like you got air still trapped.
funny mine dont have threads, you cant bench bleed it if you wanted to. but they had a threaded bleeder kit included.
mine bolts to the abs pump, the abs pump has 2 bleeders on it. so thats how i had to do it. but i also used a home made one man bleeder kit that i used to bleed everything. cause i work alone so damn much. after having the abs pump re homed, i had to re bleed it all all over again.
