There's a rattling noise on my car when pressed on the clutch?

When I press my clutch there's a rattling noise but when I take my foot off or put my hand break up it stops

What could this be?

Why did this happen?

And how much will it cost to fix?

I have a 2008 plate ford KA

I'm thinking the "throwout" bearing, AKA clutch release bearing may be bad, or the clutch pressure plate may have worn parts causing this noise.

Have it looked at by a mechanic you trust to be sure, and don't mention what you think it may be. Let HIM tell you what HE thinks.

The handbrake and the clutch are not connected so it seems that it may just be some part of the cars structure or even some of the interior trim rattling
Impossible to answer your additional questions as the cause is not known and will not be without further actual hands on investigation.

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