Why should a truck have stronger brakes than a passenger car?

When the car is moving, the following relation is fulfilled:
m * a = Ft – Ftr, where m is the mass of the car, a is the acceleration of the car, Ft is the traction force, Ftr is the friction force.
When braking: Ft = 0, a <0.
m * a = Ftr.
It follows that, all other things being equal, a car with a lower mass will stop faster. Therefore, on trucks with a higher mass than passenger cars, it is necessary to put stronger brakes in order to accelerate braking and reduce the stopping distance by increasing the frictional force.