| Re: [GMCnet] New RV Buddies article [message #112780] |
Sun, 23 January 2011 16:21  |
Gary Casey
Messages: 448
Registered: September 2009
Karma:
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Senior Member |
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Jim,
Good question, and it's true, but.... The objective of the braking system is to
be ABLE to lock up all 6. It's up to the driver to use that ability. And the
peak friction coefficient on dry paving is about 0.9 (maybe 1.0 for car tires
and even higher for race tires) and the friction of a locked wheel is only a
little less - maybe 0.8 to 0.85. So, yes, you would like to be able to apply
all the brakes just to the point of locking, but not quite. How do you do that
in the real world (without anti-skid) - and do it equally on all 6 wheels?
Answer is, you can't, so for braking on dry paving the best bet is simply to
lock them all up and see what happens. No, you won't be able to maneuver, but
the statistics I have seen say that it is better just to lock 'em up. As usual
though, every potential accident is unique. And the weight of the vehicl
doesn't change the objective. 2,000 pounds or 200,000 you still want to stop up
to the limit of the tiresw whether you have 4 or 18 wheels. Now for 2 wheel
vehicles it's a different story...
Gary
I only pose one question. Why would any reasonable, thinking, person want to
"lock up the brakes" on a 12.000 pound vehicle? The shortest stopping
distances are achieved at some point before wheel lock up occurs.
Jim Hupy
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