[200q20v] Re: Brake clamping forces

Claus Vegener vegener at post7.tele.dk
Thu Jul 5 02:09:49 EDT 2001

More or less force?
I have some results from exchanging my UFO's
(newly rebuild) to Porsche GT3 Monobloc 4 pistons
on 322x32 mm crossdrilled and vented rotors
a) Before: 60-0 Mph 155 feet
    After                   121 feet = 38 meter
(Porsche claims 35.1 meter (100 km/h)

b) Same foot-feeling. Same foot pressure for braking
c) Bias between back and front were not adjusted
d) Breaking at new fallen snow 2 km/h (with ABS on) shows
    equal breaking front and back (analysing the slip marks)
e) Breaking from 100km/h ABS off = blocks front
f) Breaking at ice/wet skid pavements from 60km/h :
   ABS OFF gives double braking length and NO control at all
   (more than 100 meter) compared to ABS ON.

I was given the option of Porsche Bi-turbo instead of the GT3 Monoblocks - same price -
but advised, that the Monoblock is
1) more rigid,
2) calliper shorter giving more cooling air to the rotor
3) the pads a bit bigger

Have to use 8x17 for both winter and summer

Finally: I don't do much about polishing my car
but the brakes are high admired at track events by
both competitors and publics

Claus Vegener
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