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RE: Braking 101
I read an article several months ago in European Car about a VW Cab that
had a tweaked VR6 in it. They also upgraded the brakes (duh!) and
claimed that they could engage the ABS at 120 mph or so. Thats damn
>From: email@example.com [SMTP:firstname.lastname@example.org]
>Sent: Thursday, April 02, 1998 3:33 PM
>Subject: Braking 101
>In message <email@example.com>
>> If that were true - why would people spring big bucks for 4 pot calipers,
>> 330 mm rotors, carbon kevlar pads, etc...These things help for repeated
>> stops as in track use, but what about that one time panic stop on the
>> freeway? If I can lock up the existing brakes easily, what will be gained
>> the above?
>Perhaps the ur-quattro is a special case ...
>The original design used 6" tyres. I posted the piece about the Germans
>working out that 8" tyres would fit.
>The brakes fitted to the ur-quattro are adequate/balanced for 6" tyres
>using the compounds that were available in 1980. Now we're running
>them on 8" tyres using 199n compounds. The tyres have a _DAMN_ sight
>more stickiness than the original design - but the basic geometry of
>the braking system has not changed, excepting the 20V's ventilated
>rears and a few percent for the MB's swept area.
>Ergo - if you're running an ur-quattro in stock form today - the tyres
>are capable of a lot more performance than the stock braking system
>will ever demand. On a warm, dry road my MB ur-quattro will crash
>stop from any speed without the ABS engaging. The tyres are so
>sticky compared with the 6" 1980 design assumption that the discs
>aren't capable of locking the wheels.
>So, for the ur-quattro at least, brake system enhancements make sense.
> Phil Payne
> Phone: 0385 302803 Fax: 01536 723021
> (The contents of this post will _NOT_ appear in the UK Newsletter.)