The problem with mine was that dirt had got attached to the sliders, the calliper was simply removed from the car and the sliders all cleaned up along with the calliper itself. The whole lot was then reassembled and tested, the amount of movement between it working and sticking is tiny, so I am not sure hitting it with a hammer will make much difference.
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Manny
2004 A4 1.8T Sport Cabriolet, 89K Miles
Past
2004 D3 A8 3.7 Quattro, Xenon, Bose, Blinds, Solar Sunroof, TV, ACC, phone and almost every option. 168K miles rising slowly
with retrofit AMI and DVB-T in place of Analogue
2003 Volvo S60 D5 SE Manual, 197K miles.
2001 D2 A8 3.7 QS, Bi-Xenon, Bose, Blinds, Electric Everything, retrofitted RNS-D, 191K Miles
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