They're not meant to have any axial play right?! I've had an unrelated issue (rear brake(s) sound like they're catching when warm), so I whipped the pads and disc off, cleaned up the caliper with a wire brush etc. noticed when taking one of my rear discs off, it made a bit of a suction sound, same again when you put the disc on.
Put my finger down the bearing and had a fiddle, found the inner race had about 2 or 3 mm of axial movement. I couldn't check my other side because I couldn't get the hub nut off. I did check some old discs I had and it moved maybe, 1 mm, but didn't make the same noise.
I also noticed with the pads off, this disc was a lot more difficult to spin, it would only do a quarter turn if you pinch and throw. The other side would do nearly a whole revolution.
This was only swapped about a month ago, and the little washer was on there too. With the larger flat face pointing outwards, contacting the disc.
Put my finger down the bearing and had a fiddle, found the inner race had about 2 or 3 mm of axial movement. I couldn't check my other side because I couldn't get the hub nut off. I did check some old discs I had and it moved maybe, 1 mm, but didn't make the same noise.
I also noticed with the pads off, this disc was a lot more difficult to spin, it would only do a quarter turn if you pinch and throw. The other side would do nearly a whole revolution.
This was only swapped about a month ago, and the little washer was on there too. With the larger flat face pointing outwards, contacting the disc.