[TheCoelacanth]

That would be true if your wheels instantly stopped turning when you applied the brakes.

The limiting factor for braking isn't the friction between your wheels and the ground, which is weight-dependent, but the friction between your brake pads and rotors, which is not weight-dependent.

[bluecalm]

Yeah, that's why it's as easy to come to a stop on well maintained tarmac as it is on ice, snow or gravel. As long as those brake pads work well that is.

I suggest taking your bike out and practice breaking on various surfaces. You will quickly get what the limiting factor is. It's the same with a car just the tires are much wider and brakes more powerful.

[leetcrew]

this isn't quite right either. most modern cars have brakes that far exceed the limits of grip for the tires. the brakes themselves should only be the limiting factor if you are riding them down a very long hill or performing multiple hard stops in quick succession (eg, racing).