MaleCortana

@iRage so I was looking at Brake Upgrades for the Starlet and Big Brake Kits costs in the 1000+ Euro range often hitting prices of 3500-4000 etc. 

Regardless I'm thinking of getting Brembo disks and Pads (should cost me about 30k) for both side (they don't sell calipers so I won't be able to bag that clout) but I'm wondering why dual calipers aren't a thing because it seems like a good alternative to increase stopping power without raking the big bucks. 

I've linked a ChrisFix video of what I'm talking about but he combined it as a hydraulic brake 

Well...dual calipers are quite common amongst drifters....that way they can run two different brake lines for different applications...standard brake and hydraulic e-brake.

For standard road cars it is more or less a matter of running costs....for starters...you might need to increase boost...thus larger brake booster...then they need to be balanced (to run properly) so you might need four-way proportioning valves to balance it out (then you have to make sure it remains balanced) . Then there is the issue of brake wear and tear...chances are that the pads might actually wear out at different intervals (i.e. at different rates).; so there is the cost of the pads and the cost of the labor.

So when you consider all those....going with four-pot upgrades (or any other for that matter) gives you a better bang for the buck.

What a lot of people do is they buy used sets. Sometimes you get refurbished/ and certified ones from manufacturers, if not you just buy it and refurbish it yourself.

Having said that...why do you need a big break kit ? planning on increasing power ? If you are keeping the stock engine with mild tune-ups...then perhaps the starting point would be better disks (ventilated, slotted, ?) and better pads...followed on by braided brake lines, etc...or even upgrading the rear drums to disks (direct fit a Glanza/GT rear). 

With big brake kits you typically would have to replace the mount plates, backing plates, etc..(sometimes the kit comes with it); plus then you need to look in to the booster, etc...so...yeah...they are not cheap.

@iRage thinking of doing a 4EFTE swap (while keeping the outside of the car and interior close to stock as much as possible, a sleeper build if you will) I'm still waiting on a good lump and a deal, but would want to get everything ready before that (Suspension, Brakes etc) sometime next year hopefully.

I've also already made plans for a Glanza V dashboard because I really want that touch AC Unit which showed up in the last run high spec models ?