ok guys, riddle me this.

every time i turn my steering wheel to either extreme - til it cant go anymore- i loose the brakes....they drop to the floor, and wont pump back up until i straighten the steering out!!

ive changed the master cylinder already.
ive bled the lines like 4 times already all teh way around, and have even replaced 'worn' looking parts....and no difference.

it makes a hissing noise in the 'master cylinder area' every time this pressure is lost, but does not draw air into the system, because they tighten up nice and hard just as soon as i straighted the steering.

if anyone has any clue, let me know, or if u know of someone who has had this problem.

thanks!
MARLON