The Search for the Extra Pedal (2017)

This simple concept allowed the rear brakes to operate on either the left or right side only, providing a clear benefit under acceleration in corners – and an instant lap time advantage. “We typically set the cars up with quite a lot of under-steer – at the time we had fairly skinny rear tyres and fairly meaty front tyres – and I had this idea to put a rear brake on in the corners, to sort of dial out the understeer. He was surprised to see that shots of both McLaren drivers showed a rear brake disc glowing at a point where the cars were under acceleration out of a corner.

Source: www.mclaren.com