I was browsing through a jap website not long ago, and from what I can tell, JZX81 and MX83 brakes are about the same.
I think the site was www.club81.net - Just use a translator like the one on altavista. There was an article on converting the fronts to R32 GTSt Type M brakes, and the rear to JZX90.
Of course, I could be totally wrong about everything. It happened once.
Mon, 09 December 2002 12:06
