Why??? will they not bolt up what is the problem? piston size should not matter right(26mm or 30mm)?

 

you'll need 30MM the rotor's thickness is about 30MM

 

ok jeff sent me this link http://importnut.net/300zxbrakeswap.htm about the brake upgrade (on a 240) but I think it will still apply. I the 91+ and the 90tt is a 30mm rotor while the 90 n/a is a 26mm. aren't the Q45 calipers 26mm also?? Would it work if I just changed the rotors to the 300zx and not go with the big brake kit whould it be a direct bolt on +the hoses. Or could I use jeffs kit and use the newer maxima's 12.8" rotors instead of the 13" cobra rotors? I could sell these on ebay but I really don't want too. Also I bought a rebuilt kit for these does anyone have Directions on how to rebuild them?

A side note I do have access to several sets of Q45 and j30 calipers if anyone is interested in them.

 

Either kit Matts or Jeffs require relocation brackets. The brackets were designed to be used with the 30mm calipers.
You can just use the 26mm calipers and 300z rotors to go with them, instead of a true BBK.
You will need conversion brake lines ,the rotors will need to be milled down a bit, and the heat sheilds have to come off. Some grinding on the lower control arm will also need to be done to go that route.

 

they will bolt up fine but rotor position will be off and things will rub and lock up and cause ur car not to move

 

well S**T!!!!!!!!!!! I just bought these things and was told when I bought them they were the right ones and found out later they weren't I guess I could use them as cores for rebuilts tell them they are off of a 91. Does any rebuilts still have the nissan logo on them??

 

THEY ALL DO.....i did the saem thing...i bought a set from my friend with a 300zx and he told me they were the larger 30mm calipers i didnt have anything to verify it with...i got them home and they were wrong so i used them as cores...no one knew the diffence.....oh and Autozone and advanced auto will list them as 2 piston calipers...but they are really 4 and still have the Nissan logo on them...i got one form NAPA and one from Advanced auto..

 

how much did you pay for them? I noticed some years seemed to be cheaper (alum. years was cheaper??) are they still alum or do they mix and match?