Why are the brakes rattling on my Opel Astra GTC?

Hi Mike,

First thing to do is bring the car back to the dealer. It's very new and is hence covered by warranty. Trying to fix it yourself could invalidate the warranty.

Without hearing the problem for ourselves it sounds like it could be something small like the dust shield vibrating against the caliper, but definitely worth getting it looked at.

Let us know how you get on.