To start with, I'd like to say that this is only about the standard Sumitomo calipers, not Brembo upgrades or anything like that :)

 

Anyway, I have a set of alloy calipers on my Zed at the moment and a set of cast iron calipers that I bought to refurb. I think right in saying that the alloy ones have the "ribs" around the piston mounds on the outside, whereas the iron ones don't have these... is that right?

 

Which are the better (or more preferred) calipers? I seem to recall there was some issue with warping with the alloy ones, or is that a bit of a myth?

 

So, which set of calipers am I going to be better off refurbing - alloy or cast iron?

 

:)

Myth. Never known or seen a Sumitomo alloy caliper distort.

 

I'd personally stick with the alloy caliper. It's lighter and doesn't really corrode.

With the cast-iron calipers, are all four made of iron or just the fronts...?

With Funki on this one, the cast ones are heavy and seize more often, unsprung weight slightly lower as a bonus, and also never seen warped calipers of either type, one of those 300zx myths like the one in all "buying a 300zx guide " that say the alternator is a week point and WILL fail at around 75k miles ?? simply they do not.

 

Jeff

I have heard alloy calipers can flex on there mountings under extreme pedal pressure this maybe a myth too .