An interesting thing is that there are three channels in Ford - one presumably leading to the rear differential and two seem to lead to the brake but why two? Do they intend to increase effectiveness by sending the air on larger area of the disc or is it for some other reason (or cooling of different part)?

Also I haven't seen yet any photo of Yaris with hoses installed at the rear axle. Do they use them at all? Also the damper canister is at the frontal side of the strut i.e. possibly affecting the air flow coming to the brakes (not that it wouldn't enjoy some cooling).

It's also interesting that Hyundai has the air intakes so high under the windows. I guess that it must be to prevent dirt coming into the air channel.