Motorcycle Forum / General / Yamaha / August 2003

Hi to all,
Can anyone advise what could be the cause of a bad 'juddering' when I apply
front brake.
I have replaced all 4 pistons/seals/pads and changed to BF Goodrich hoses (2
lines), it is just as bad as it was before. I am thinking..discs warped? Or
could it be the forks?  Anyone out there had similar prob? The bike has done
approx. 30, 000 miles, is 5 years old, and otherwise problem-free.
cheers
Rob