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Discussion Starter #1
why is the back disk brake bigger than the front that is pointless because when you hit the brakes all the force goes forward and the back brakes end up doing half as much as the front.
and why is the front ventelated and not the back which is bigger and holds heat longer/
 

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It is sort of odd!

I think that they decided that they could use a cheaper non ventilated rear (since as you pointed out there is less braking force and thus less heat on the rears), but calculated that it had to be a bit larger to stay within their tolerances for heat buildup (on a non ventilated rotor).

I see this as a good sign - that Toyota/Lexus really fine tuned the brakes to their exact engineering specs.

Many of the early reviews have said that the IS300 had "world class braking".
 

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Also, when you look at the brakes up close you will see that the rear piston/calipers looks alot different than the fronts. I think that the rears use one large piston, and the fronts use two smaller ones.
 
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