Celica GT4 brake calipers

[firehawk]

We've got the stock AE82 main cylinder for now but will do some testing first thing when the snow melts to see if it moves enough fluid. If not, we'll need to find a bigger one to replace it.

The rear brakes are also stock AE82 ones for now. We've got an adjustable proportioning valve so we should be able to get the brakes balanced. If the rear brakes aren't up to the task, we might need to see if we could run MR2 rear brakes as well.