[s-cars] abs purge procedure

[Robert Rossato]

G60s are 2 piston calipers, but you knew that so I'll assume it was just
a typo ;-)

I don't know what the relative piston diameters, and depth of the piston
cavities, are for the G60 and 993tt calipers, but my understanding was
that there was a larger volume in the Porsche calipers.

> -----Original Message-----
> From: s-car-list-bounces at audifans.com 
> [mailto:s-car-list-bounces at audifans.com] On Behalf Of Mark Strangways
> Sent: Sunday, December 17, 2006 6:03 PM
> To: Mike Fitton; keith at maddock.com
> Cc: Robert Rossato; S Car List
> Subject: Re: [s-cars] abs purge procedure
> 
> 
> I don't actually think the Porsche calipers are have any less 
> fluid then the 
> G60's.
> Remember that the Porsche are 4 piston and the g 60 is 1 piston.
> 
> The proportioning valve works on pressure principals not flow.
> You may find that if the front NEW calipers contain less 
> volume than the OLD 
> calipers, you will get a firmer pedal due to the higher force 
> required to 
> exert the same pressure and you will also find that they react faster.
> The reverse would be true for the rears if the NEW calipers 
> where large 
> volume.
> 
> Either way I don't expect you will have any problems.
> 
> As Robert beat me to it... you will find there is a ton of 
> pedal firmness to 
> be had by servicing and adjusting the rear calipers properly. 
> Many factors 
> can lead to the pads being way to far away from the rotors, 
> this adds the 
> need for more fluid volume to the caliper before it starts to 
> build force.
> 
> Mark