Could someone tell me if its normal to have some play in the rivits on a GK76A brake disc

ie the discs chatter when pushing the bike and you can wiggle them up and down slightly but NOT side to side

Thanks
Ric

No, that's normal, if they start moving side to side then there buggered.
When the discs get hot they expand, try moving them after you've been on a ride and they won't move (as much).
In short, it stops them warping.
Matt

Thanks ill give that a go