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Twitch: Rear of car want's to pass front of car, usually much faster than occupant desires, most often on wet or icy roads when right foot has uncontrollably fallen to the floor and the TVIS opens up. Remember Murphy is alive and well and he hates nice shiny cars that go fast.
Remedy: almost 100% foolproof, when it's wet or icy out, drive like the Drivers License Examiner is sitting in the seat next to you. He has a tazer pointed at your lap and an evil gleam in his eye!
All kidding aside: physics dictate that a car will rotate and put more weight on the front wheels during braking. Asking the rears to do more than designed to by changing the stickiness of the pads on the front and rear will probably diminish the overall braking ability of the car. As in - it will take longer to stop at any given speed.
Drilling rotors lightens the rotor (reducing unsprung weight which is good) and gives the pad somewhere to squish water into when it rains. It also increases surface area of the rotor, thus increasing it's ability to shed heat. It can also lead to premature pad, failure, and an unbalanced rotor. If not drilled correctly can also lead to catastrophic failure.
After pondering this mod long and hard I decided that the Toyota Engineers went to school and then practiced with a lot of the factory's money to give us the best they could with the money they had available.
Bigger wheels, with bigger discs and bigger pad assemblies with more pads would probably help, but I've been flogging mine hard for years and only once have my tires failed to stop me in time, close enough that no damage was done. My point is the stock brakes are pretty awesome, the SS braided lines were an improvement over stock.
Spend your money on struts, springs, bushings, sway bars and SS braided brake lines. I guarantee it won't feel like the same car.
Keep the shiny side up and don't swap paint!
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