In reply to BA5 :
I drive my 2017 Mustang GT on a very narrow track with lot's of brake zones (4) without any long straights(longest is 1/4 mile). I put good suspension and 305 AR-1 tires. So this mean that my GLoc Fronts R12 Rears: R8 pads are not up to the task of stopping the car all the time. In fact I can only make a few laps before the pedal become hard usually at the latest brake zone and I loss time. The Mustang is heavy car and 1.48G of brakeing is a lot of braking generating a lot of temperature.