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Re: 07 Megane, rattling brake pads
Don't think there are shims, just the anti rattle spring you have removed.
Slghtly undersized pad backing plates along with the paint wearing off the ends.
A bit of wear and over zealous cleaning of the carrier.
excessive wear of the sliding pins or holes.
Any or all the above can contribute to the problem.
If you are looking for a quick fix, I would take the pads out and lubricate the ends a little and maybe look for some double sided sticky anti squeal shims for the back of the pads. If you can still get them that is.
Once the pads stick to the caliper and piston they should stop rattling about as much.
Currently in lancs dave's garage:
Scenic 1.4ish 2002. Clio 1.2 2002. Thunderbird 885 1995, Suzuki Gsx600f 1989. Fazer 600 2002. Specialist cement mixer for proffessionals only, not yer average forum numpty. Your car is probably worth more than all that lot put together.