Brake Problem? Disc movement?

[robefumi08]

After having problems with my brakes, squealing etc. When i had a look at the discs the surface looked rather dark,
and looks like they are glazed?

However i spun the wheel to see if the pads where sticking only to discover that my right disk moves up and down,
when looking directly at the front of the bike, not by alot but enough. The left hand side doesn't at all and these
are fairly new discs.

I had a recent problem with a sticking piston on the left side where it made the pressure through out the system
all crap and the breaks ended up locking on, hence why i think the discs are glazed as this locking on was
constant and i had just put new pads in.

Is it a Major problem that the disc moves slightly up and down or is it ok?

regards lee jay