400ex brake problems

[nismo]

my front brakes will not build pressure and push the piston out at all. i have bled the lines a few times changed the res. on the handle bars and replaced the fluid in it. any ideas? they lost pressure after i was bleeding them b/c my brakes werent working very well.

any help would be great
one of my friends said something about back bleeding them any idea how to do this?

[JDiablo]

umm sounds like your piston might be seized,try taking the caliper apart and try to clean out all of the rust and dirt