I've felt what it is like on cars such as the W202 and W208 with no boost at very low speed. I don't think I would be able to stop the car with both feet on the brake from any amount of speed. As a wild ass guess, I would dare to say you would be looking at required pedal forces well into the hundreds of pounds to stop the car. I don;t know if I may be exagerrating but I am sure it takes significantly more than 10 times the pedal effort. Maybe at least 25 times or more the pedal effort with no boost.

You can give it a very, very catious and low speed no one around try and see what you think. I honestly think on a car with disk brakes and no booster, you will forget you even thought of the idea when you see what it feels like with no boost. It is probably downright scary.

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Ali Al-Chalabi

2001 CLK55
1999 Dodge Ram 2500 Cummins Diesel
2002 Harley-Davidson Fatboy
Merlin Extralight w/ Campy Record