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just change the pads when they look out. before they are down to the metals/rivets, some have a wear indicator ridge on the lining material, some dont. the manufacturer will state a minimum thickness but its usually b****cks! disc thickness however is important!
data aviailable from renault (phone em tomorrow?) and you need a digital doo-daa (vernier caliper ect) to measure em. but basically if they are badly ridged, cracked, scored or generally f*C&ed change em!!