Another question to ask is if the bolts were torqued up with the arms being in correct angle. If they are done in the wrong angle they can get too much twist when car is lowered on wheels and rubber delaminates from metal. I know a friend who changed arms on his A4, tightened bolts while the wheels were still in the air, went to MOT couple of days later and failed because rubber had come loose from the metal in bushes.
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Currently 8less
2011 Q7 S Line 3.0TDI, 2016 Tesla Model S 90D
8 history:
2006 A8 Sport 4.2TDI quattro SOLD,
1997 S8, reached end of life with gearbox failure
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