No, under ideal friction the reduced traction is cancelled out by the reduced mass that needs decelerating, so that braking distance remains constant. But actu

No, under ideal friction the reduced traction is cancelled out by the reduced mass that needs decelerating, so that braking distance remains constant. But actually, braking distance vs mass is more like a bathtub curve. With very little weight (talking toy cars here) it's hard to grip a surface, meanwhile very large masses like trucks have huge amounts of kinetic energy to disperse through their contact patches, leading rubber to melt, which reduces its stickiness beyond a certain point. Trucks end up with longer braking distances in practice.