[BillCNC]

Math is an Absolute,...

Take a piece of chalk, ... rub it on your shoes covering them completely in chalk. Now go take your car around the block and then pull the drum's. You will see exactly how much braking contact you have.

Now calculate the square inches of contact vs no contact, ...

Sure, if your shoes have the same area of contact you might not have issues. However, that's rarely the case. If not, all the tires will grab differently and it can get bad.

Regards
Bill