Re: ABS question

From: Andy Callahan (quasideedle@uky.campus.mci.net)
Date: Mon Dec 08 1997 - 16:05:15 EST


At 12:06 PM 12/7/1997 EST, you wrote:
>In a message dated 97-12-06 19:14:56 EST, you write:
>
><< I don't want to put
> two different sized tires on my truck, I was just wondering why this is. Why
> would the ABS brakes screw up if you had a different sized tire on the back
>then
> in the front on a 2 wheel ABS system? >>
>
>
>
> It would read one tire slowing down faster than the others. This would
lead
>it to believe the wheel was slipping and it would try to compensate. The
>sensor on a 2 wheel drive unit reads the axle speed. If you had a tire with a
>greater circumference on one side, the ABS would think one or the other was
>slipping.
>

If you are talking about one size tire on the left side and a different
size tire on the right side of the truck, then I think your answer depends
on what type of differential the truck has. If it is a sure-grip, then
both tires will turn at the same speed, causing one tire to slip. This is
what happens in Nascar when the cars use "staggered" tire sizes. It helps
them turn in the corners, but it causes slippage on the straight-aways and
tire wear. If it was an open differential then your answer might apply.
I, however, understood the question to be about different sizes between the
front and rear, and I can't understand how that would affect rear-only ABS.
 This is all just my opinion and I may be totally wrong.

Andy

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  Andy Callahan University of Kentucky quasideedle@uky.campus.mci.net
                http://sac.uky.edu/~accall0/truckpics.html
        
  '97, black/mist gray, 4x2, Sport, club cab, 3.55 SG, 5-speed, Tire &
         Handling Package, all the little goodies
  Mods: Firestone Firehawk SS10 275/60/15's, GT Classic steel tonneau
         cover, "Super Sucker" FIPK by Air Meldrum, CC bed mat
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