eriklane at gmail.com
Sun Nov 29 12:57:37 PST 2009
I don't disagree with anything about there being differences in the
brakes, and that causing differences in braking. I'm more interested
in differences in stopping distances between a passenger car and a
semi truck with brakes locked up. No slipping of the brakes, pure
kinetic friction between the road and rubber. Ever since I first heard
that mass didn't come into the equation it's interested me.
But I also suspect, after further reflection, that truck brakes are
somewhat limited from locking up, at least on the cab, from a
standpoint of retaining control. If you have too much more braking in
front you're in danger of jack-knifing and losing all control. I am of
the opinion that it is likely more dangerous to have complete loss of
control and jack-knifing, with the trailer going all over the place,
than having a longer stopping distance while limiting the amount of
braking going to tires at the front of the 'train.' This would also be
consistent with an unloaded trailer having a longer stopping distance
than a loaded trailer. I bet it's not a simple thing, but is very
closely controlled to optimize braking while retaining control.
I know that ABS can have a drastic difference on stopping, because of
its superior properties, but in this I'm thinking that neither vehicle
would have ABS to simplify and make the two more similar.
More information about the Vwdiesel