Jim, have you considered an ABS shut-down switch for the times you drive on 
soft surfaces?

I think you'd just have to do something like interrupt the power to the 'brain' 
which would cause the ABS to be disabled AND activate the light to remind you 
that you've got to move the switch back to regain ABS.

-Max

-----Original Message-----
From: [email protected] [mailto:[email protected]] On 
Behalf Of [email protected]
Sent: Thursday, April 22, 2010 4:04 PM
To: [email protected]
Subject: Re: [MBZ] The value of ABS

> > I really don't understand why you don't just fix it.  It's a safety 
> > system with proven worth - why not repair it?
> 
> Except on loose surfaces, where ABS can actually do more harm than 
> good.  (Such as fresh snow or slush, or gravel, or [like the road 
> immediately outside our driveway] a steep gravel road often covered in 
> fresh snow or slush!)
> 
> ABS is nice enough, but once it starts acting up so that you can no 
> longer trust the brakes, and the easy/obvious repair attempts don't 
> work, then I say that I'd rather disable it than mistrust the brakes, 
> or dump thousands for new ABS parts into a car that cost less than 
> that in the first place.
> 
> -- Jim..
> 
I'm going to have to disagree with this and here's why. 

I am now on my fifth ABS equipped Mercedes since 1985 and it's value under 99% 
of low traction conditions has been proven to me let's say, a time or two. The 
ONLY malfunction I've ever seen was a one time failure in my '89 190E
2.6 on a twenty degree morning after a big snowfall the day before. The ABS 
light came on, indicating a fault caused shutdown, which cured itself later 
that day, never to return. 

If one reads the road tests of new cars in the German magazines and look at 
their braking test categories, they test on dry and wet surfaces plus snow and 
ice if available and under split mu conditions. They publish numbers for these 
tests with the brakes both hot and cold. ABS can really pay off when you might 
have a road surface with sand, loose gravel or snow/ice on part of it (near the 
edges, usually) with the rest wet or dry. The stopping distances between makes 
can be substantial.

It's true that some Audis used to have an ABS shutdown switch for stopping in 
loose snow or gravel (who drives in loose gravel, really?) and the value of 
pushing a wedge of something ahead of non-rotating tires can be seen.

My 26.5 year old Porsche doesn't have ABS and when I drive it in the rain 
(almost never if I can help it) I have to keep in mind that it just can't stop 
as fast on wet pavement as my MB at freeway speeds. After an episode of locked 
and sliding front wheels and not much speed reduction, I got the message.

A car with full traction control must have working ABS because it's part of the 
whole package.

RLE


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