N/S/F rattle/brake disc movement

[Viperous]

Afternoon people

Have a slight issue with my 2010 A3 8P - there's been an annoying rattle that recently started, I only hear it at low speeds when the N/S/F of the car goes over a rough bit of road. 

I took the wheel off today to have a look at it and there's play in the brake disc (it moves in slightly when pushed and basically makes the same noise I was hearing when I was driving). Now, the brakes are currently absolutely fine with no judders or noise etc when I brake, and the car doesn't pull to either side.

I've been looking on Youtube etc and some people are seem to blame the wheel bearing for this issue. However, I had the N/S/F bearing replaced back in December by a VAG specialist when I first bought the car, so surely this can't be the issue?

Cheers guys

[cliffcoggin]

Rob.

Even if the single screw that holds the disc in place is loose, the wheel studs provide the main securing force, so the main question is whether the disc is moving independently of the hub or is the hub moving with the disc. If the hub is moving with the disc then the bearing is worn or loose.

[Viperous]

11 hours ago, cliffcoggin said:

Rob.

Even if the single screw that holds the disc in place is loose, the wheel studs provide the main securing force, so the main question is whether the disc is moving independently of the hub or is the hub moving with the disc. If the hub is moving with the disc then the bearing is worn or loose.

The grub screw has been sheared off anyway!

The hub isn't moving, the disc is moving independently so I guess that means the bearing is ok?

Is the disc just warped or something?

Cheers for your help.

[Magnet]

Hello Rob, 

I’m very much with Cliff - shoddy workmanship not have replaced the large grub screw, but not essential, and should not result in any disc movement when the road wheel is properly secured. 

I’m confused. Can you just confirm that there isn’t any movement of the disc when the road wheel is on and tight? You are referring to (understandable) disc movement only when the wheel is removed? 

Can we clear this up before moving on. 

Kind regards,

Gareth. 

[cliffcoggin]

In hindsight I didn't phrase my reply very clearly, so as Gareth said test for looseness with the wheel bolted on and let us know the outcome. Do the test with the wheel off the ground, rocking it left & right and top & bottom. Listen and feel for any movement as well as looking, your ears and hands can give valuable information.

[Viperous]

Hello guys

Thanks for the responses, I'll jack it up again tomorrow and have a little test again, and then let you all know the results.

Cheers

Rob