Metallic/springy noise on hard cornering

[MattyAB19]

Hello,

I am really struggling to diagnose the cause of a noise on my mk5 GT tdi (170). It’s standard (hasn’t been lowered or anything) and the noise seems to be most noticeable and quite loud when cornering hard left at 30mph or more. Sounds sort of like loose or rubbing/springing metallic noise. I once had a car with a similar sound and the whole rear brake gubbins had corroded away within the rear drum brakes. But this has rear discs. It also happens occasionally when I let off the brakes just as I am slowly coming to a stop in a straight line. It seems to be coming from rear left wheel area but it’s very difficult to accurately pinpoint.

Please help if you can! :)

[Flyingscotsman]

I would check to see if one of the rear coil springs is broken or cracked.  Quite common on these cars. 

[GVK]

Rear spring or rear disc back plate failed around the mounting points

[MattyAB19]

Thanks both of you for the fast replies. Rear disc back plates look very rusty but seemed to be solid and no movement. Springs also look very rusty to the point where I could pick off bits (of old paint possibly), although I couldn’t see any obvious cracks. Here’s pics of the springs. I’m gonna try the springs first, then change back plates when I next get rear brakes changed. Thanks!

[GVK]

They normally snap at the bottom, if you remove a rear wheel you can see the bottom of the springs better

[MattyAB19]

Here’s 2 pics of the bottom. Definitely rusty looking but tbh I can’t see a break. I checked brake disc back plates again and they are slightly wonky so that there is a 4-5mm gap between it and the brake disc at the top and they are touching at the bottom. If I flick the back plate with my finger it’s a very similar kind of noise to what I’m getting. I wonder if when I corner harder, it’s just enough to rub the brake disc against the back plate?

[bobby_fodge]

In the last year both of the shields on my rear brakes rusted out.

On one side all of the fixings rusted through so as I drove the shield was completely loose and making a very loud sound.

The other side was only partially loose so it made less of a noise, louder with the windows down.

[breeze]

You might have heat shields that have dropped down above the exhaust. Possibly due to one of the fixing rusting out.

Also check your exhaust isn't making contact at the downpipe. Not really an issue with standard exhausts, quite common with aftermarket.