How hard does an F1 driver have to push on the brake pedal?

The drivers really have to stamp on the brakesF1 car brakes are similar to normal road cars, only they are made with different materials and operate under considerably... There's more... with every application, almost standing up in the car to do so. On road cars, servo-assisted brake systems multiply the pressure you apply to the master cylinder but the regulations in Formula OneFormula One is the pinnacle of open wheel,  single seater car racing and arguably the highest level of any motorsport... There's more... demand that the braking force has to be generated by the driverOK, so we all know what the driver is, right. I've always liked the description that F1 drivers are like... There's more... alone.

They need very strong legs to do this, but they do get some help from the violence of the braking manoeuvre itself. The cars decelerate at around 5G (compared to the 1G we might see during an emergency brake in our road cars).

At this deceleration, their leg will weigh approximately 100kg, and the weight of their leg on the brake pedal provides its own form of servo-assistance to help them – the harder they press, the more the car slows, the more it slows, the more their leg weighs which helps them to press harder.

What is remarkable is that in the midst of all this, while pressing the pedal with well over 100kg of force, the driver is required to modulate his effort on the pedal with all the delicacy of a concert pianist in order to coax the car through the cornerIn formula 1, a corner is much more than a turn on the track, it is a considered and deliberate... There's more... at the very limit of what the tyresToday's F1 cars are running 18-inch wheels (up from 13 inches in recent years) with the widths unchanged - 305mm... There's more... will permit – it is a delightful contrast of violence and gentleness. 

This answer is a snippet from an article on F1F1 is the pinnacle of open wheel,  single seater car racing and arguably the highest level of any motorsport globally.... There's more... Brakes on the AMGAn iconic sports car brand, AMG was founded in 1967 by two former Mercedes-Benz engineers. The company would go by... There's more... MercedesMercedes-Benz, a brand of the Mercedes-Benz Group, has been involved in Formula One as both team owner and engine manufacturer... There's more... website. See the full article – here