Originally Posted by rodsterinfl
On the brakes, that is a controversial issue. For handling and performance disc is better but in most heavy weight applications and unclean environments drum brakes are used as they have greater frictional area.
I don't know the formula for calculating braking power but aren't drum brakes basically obsolete in modern passenger cars and pick up trucks? I do know the formula for the torque capacity of an automotive clutch and AREA is not one of the factors, looks are deceiving.
I have a picture that I took of the back of a semi trailer with a Canada license plate.
"CAUTION DISC BRAKES 30% SHORTER STOPPING DISTANCE"
Just search disc brakes for semis for lots of reading.
I'm really glad my Dodge Ram and Airstream both have disc brakes.