I have a 100% factory original brake set up on my 73L with 30 K mi. I drove it over 800 mi since july getting used to the car. I have pushed it hard over 100mph for many miles In very hot July aug to see how it preforms A, it never over heats with stock radiator, B it brakes fantastic at all speeds, never heats up or looses pedal In fact my 46 yr old suspension is still like new. I build and restore all type of cars and I can tell you once you change any component from the factory set up you will end up changing many component's. My 69 Camaro SS for example came with new front discs and I have been chasing a RF wheel lock up for 5 years. changing out every component to no avail some things twice. To solve the problem I added an adjustable valve to one wheel and it finally solved the problem.