Hi guys I am having serious braking issues with my Glanza. I run levin twin pot calipers on the front, grooved discs on the back and HEL braided lines all round. A few days ago I got a Tegiwa brake master cylinder stopper fitted and since then the brakes are lethal. Up to 50mph they stop okay but anything over that they keep locking up on me. Before my brake pedal used to engage fully around two thirds or three quarters of the way down, whereas now its like it's hitting something solid not even halfway down and it won't let me engage the brakes fully. Then sometimes the pedal hops up and down slightly under my foot. At high speeds it's very dangerous and my only way of slowing the car is down through the gears and using the handbrake which I don't want to be doing. Could it be that the cylinder stopper is too tight? also would it help running 5.1 brake fluid instead of dot 4? It feels like there is still a bit of air in the system as they are a bit spongey still, or maybe the dot 4 is causing bubbles in the system with the heat? Also do EBC make red stuff to fit levin twin pots? Thanks, Conor.