Does anyone in here know what size the front hub retaining nut is that is located behind a retaining carter pin and in the center of the brake rotor? It is a fairly large bolt, but I am not sure what size? I think this is causing some problems with looseness on my bro's 1990 Maxima se. Thanx for the info.

 

for my 93SE, it is 36mm; I'm pretty sure it'd be the same for that car

 

I doubt if it's loose.. it's probably a bad wheel bearing behind it.. but check to make sure it's tight first.. that's the cheapest thing to fix.