The stock caliper is some kind of ferrous metal, probably not steal but iron as they can rust.

Most Bbks I would guess are aluminum in construction.

As far as the spoon monoblock caliper vs the stock slider, the spoon is going to have more brake fluid capacity (probably 2x the amount over stock slider) 4x the Pistons (not 4x the piston surface area, probably not even 2x as much) to get the heat from the pad/rotor in to the brake fluid and then to the piston.

Anything that can be done to reduce rotor, pad and brake fluid temperature will increase the longevity of the pad life

The reason I suggested the spoon over other bbks, is because it's easier to fit under wheels, won't throw off your braking bias, lowers the overall temperature of the braking system allowing longer intervals between bleeds and greater pad life. You don't have to use outrageously expensive rotors and fear not being able to get replacements if a product reaches end of life


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Could be... I didn't keep my stock brakes long and the calipers looked nearly new when I removed them and gave them to a friend.

That has nothing to do with my original statement in reference to the statement I quoted from you:

Multi-piston and monoblock design, by themselves do not mean they will reduce temperature, which was I commented to.




The S2000 rotor will reach end-of-life before a common BBK ring. BBK kits adapt common rings to the cars, not the other way around... and with far more options/brands/compositions. Rings can vary in price, but they'll last longer, especially some of the heavier duty rings.

As far as bias... I did some searching and came upon this thread: https://www.s2ki.com/s2000/topic/569...ost__p__855998

If these are true, the piston area has increased to 4.009 from 3.547. Bias is now further forward.

 

I think yamahasho is trying to say that the blingin spoon calipers don't help that much in terms of heat dissipation, and I'd agree. Their biggest improvement is likely feel/modulation. Heat reduction is somewhere towards the end of the list.

Are they better than OEM? Sure, but the biggest problem with the OEM brakes isn't the caliper, but the smallish rotors. A different caliper that uses larger calipers/pads will certainly help dissipate the heat over a larger area and help the brakes last longer, but ultimately it needs larger rotors.

 

My fronts are grossly larger in size than OEM and brake bias is fine. ABS tends to hide any imbalance anyways, which apparently these cars are rear biased from the factory.