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Re: laguna ii caliper carrier bolt size&pitch
Almost certainly a standard metric thread.
But which one ???
Almost certainly a high tensile as well.
So if buying new ones, specify that, min 8.8 grade, 10.8 will do not harm.
If rounding nut, find an hex socket of right size. Impact sockets are invariably six sided instead of the more normal bi-hex (12 corners)
The latter only grip on the corners of the nut, hence rounding them off on a tight one.
If you have a friendly local garage, you could always ask them to remove with an impact gun... will cost a little but once loose, you can get onto changing the pads etc yourself.
Currently in Dancingdad's garage:
Qashqai 1.6 spark driven, Kia Sedona 2.9 TDI, Scenic II 15DCi 2004 (SORN) not quite RIP.