i have used Cadence braking (if it means pumping the brake)
in emergency situations seveal times. seemsto happen to mea lot in autum when the wet leaves come out to play Black ice.
but for high speed braking, i noticed that if i load up the front suspension gently but quickly with the weight, then i can brake alot harder before losing traction.
i learned that technique from my time with Motorbikes.
but on a car, you do need good brakes that wont go buttery, from 90 to stop.

testing the brakes is the first thing i do when i get a new car.
but i have to wait till night time to test the high speed braking.
At the moment, i'm teaching myself to let go of the brake for a split second to tap the accelerator, before releasing the clutch in a lower gear, and back on the brakes. i dont think i'm articulate enough to Heel&Toe
& i dont want to uneceessarily strain my drivetrain.
