I spent some time researching the brakes on the 3/4 ton RAMS
compared to the 1/2 tons.
I would like to clear some misconceptions up and lay to rest this forum myth that 3/4 tons somehow stop better than a 1/2 ton.
The 3/4 ton's 'heavy duty' brakes vary only slightly in comparison to the 1/2 tons. You get a hydroboost in placement of the vaccum boost and 3 piston calipers upfront.
The half ton features standard vacuum boost and 2 piston front calipers.
The 1/2 ton has an 13.230 in rotor and the 3/4 ton has a 13.855 in rotor.
The rotor thickness difference between both of them is very slight.
The reality being, that both vehicles actually have similar stopping power and stopping distance. The hydroboost just provides better equal line pressure to the brakes.
If you're load is appropriate to your vehicle
, both should perform well. There is no 'heavy duty' braking. It's more marketing. Yes I am claiming it's marketing, because the reality is it's engineered properly for the task. Take it how you will. Greater mass, needs more rotor. But they're equal for the jobs being done. It's literally scaled up. But know I talking about proper application. (Not will my Jeep Cherokee stop 11,500lbs as effectively as a 3/4 ton, because the math says NO)
I'm saying they are about equal. And that when a half ton is towing an appropriate load, it will stop shorter of the 3/4 ton with equal load because of less mass.
That being said, let's explain some physics to you guys.
Assuming proper operation of the brakes, the minimum stopping distance for an automobile is determined by the effective coefficient of friction between the tires and the road. The friction force of the road must do enough work on the car to reduce its kinetic energy to zero.
he bracking force is
the normal force is the weight which is proportional to the mass.
where g is the acceleration of gravity. so the braking force is
and that braking force is proportional to the deceleration a of the vehicle
so the deceleration due to braking is
independent of the mass of the vehicle. the increased mass increases the braking force, but it also increases the momentum by the same factor. if the vehicle was on a slippery surface, ks would be less and the vehicle would decelerate more slowly. if the vehicle was on the moon, g would be less and the vehicle would decelerate more slowly. also if the vehicle is pulling a trailer which does not have braking on its wheels, that increased mass from the trailer and load contributes to the momentum, but not to the braking force because only the pulling vehicle weight is pushing down on its wheels (that have brakes), so it decelerates more slowly.
if you know the velocity when the brakes are applied, the braking distance is:
and since the final velocity is zero
then you can calculate the braking time
In laymen terms, it's simple. Proper vehicle application. But please don't go around claiming a 3/4 ton stops better than a half ton because of 'heavy duty' braking.
End of rant.