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The A-arm bushing is on the suspension while the idler arm bushing is for steering.
Mine does a "tuk" sound when I brake but since my front suspension (W123) needs some fixing on Wednesday I will just let the mechanic fix it and if it still is there then it's something else.
A rattling sound could be the ball joint, as in a "tuk" when you brake. A creaking sound is rubber bushings.
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