[Es2] RE: 996 caliper weight?

Miller, Chris chris.miller at infofoundry.com
Wed Apr 13 08:08:02 EDT 2005

Brandon:  the outer diameter of the rotor is too big?
Make sure you leave some clearance; I expect the rotor grows in diameter
as it gets hot, and it will need the clearance so it doesn't hit the
caliper...  That would be bad. 

-----Original Message-----
From: Brandon Hull [mailto:Hull at cardinalpartners.com] 
Sent: Wednesday, April 13, 2005 8:02 AM
To: Miller, Chris; Ben Klumper; eS2 List
Subject: 996 caliper weight?

Whew, Chris, you get archivist of the week award!   I used bira system2
(996 cal/s4 rotor) on the eS2, and weighed it when I did the swap.  It
was definitely less in weight than the G60 setup, but I can't find the
details, and can't remember where I posted them.  I just checked the
bira website but no luck.  I do remember the same relationship between
component weights, ie the S4 rotor was much heavier than the G60 rotor,
and the 996 caliper was much lighter than the g60 caliper, for a net
reduction of a couple pounds.  
Interestingly, I just put new front rotors on the S2, and one side
rubbed the caliper very slightly such that I had to grind it down. (jack
corner up, start engine in first gear, hold a file against the rotor
edge!)   Amazing that manufacturing tolerances could be so sloppy.  It
must have been at least 1mm in diam bigger than the one it replaced...

> See below. The Carrera brakes are a bit larger than the Boxster brakes

> that were weighed, but you get the gist. Chris
> >From Eric Fluhr's post to the Quattro List, 06/06/00
> Ok, I finally finished upgrading to the BIRA System 1 on my Urquattro,

> replacing the G60 brakes I had installed last year (and toasted at 
> several track events since then). Hopefully this will be a reasonably 
> objective comparison of the BIRA versus the G60 brakes on my car.

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