Re: brake fluid anyone?

[Porsray@aol.com]

if you are running Metalmasters and OE pads at a tracke event, my feeling is
that this is a prime cause of your problem.  These pads transfer all the heat
into
the fluid, causing it to boil.  Try running a set of Cool Carbons on the car.

Up until this year, I was running a Turbo-Look Porsche Carrera at about 4-7
track events a year since '92.  The factory pads would not hold up; the 
pedal got spongy quickly and the pads looked like they had overheated 
pads cracked and chunks out of them).  Switched to Cool Carbons, could
run a whole weekend without any trouble (also installed a brake cooling 
ductwork kit for the front brakes).  After about three years, a local Porsche
expert recommended the Pagid Yellow compound.  Well, I ran them for 
2 track sessions, and the spongy pedal returned (thought at first I hadn't
bled the brakes right).  I switched back to Cool Carboons and the nice 
firm pedal returned.

Above was run with Castrol LMA, for info.  I am now running a 993, and have
tried both the LMA and ATE Super Blue; the ATE held up better under track
conditions.


Ray Calvo (porsray@aol.com)
1990 Coupe Quattro
1995 993




In a message dated 96-09-20 08:00:47 EDT, you write:

<< 
 From: a6561TB@gnn.com ()
 Date: Fri, 20 Sep 1996 01:40:09
 Subject: Re: brake fluid anyone?
 
 >What brake pads were you using?  Are you sure that it was fluid boil that 
 >you were experiencing?  I've been running ATE Super blue (BTW That's BMW 
 >OE Fill...... It's just not blue for them)for a long time and I have 
 >never had the experience that you have described.
 
 Day 1. Went through a set of Metal Masters
 Day 2. Went through 1/2 set of OEM's
 
 I do destinguish between the fluid fade and the pad fade. I had both. 
 The brakes "slipped" so to speak, requiring an increased effort on the pedal

 - - that can be attributed to the pad fade.
 
 The pedal itself had increased its free travel by good 15-20mm - that's 
 fluid fade. It only occured after a coule of laps with some agressive 
 cornering and went away after the cool down. I did bleed the brakes once a 
 day with a pressure bleeder - air in the lines was never present. It's gotta

 be the fluid boil!
 
 BTW, I have teflon lined stainless steel braded brake hoses in all four 
 corners. Therefore I can't attribute the fade to the radial expansion of the

 brake hoses either.
 
 Later,
 
 
 
 Igor Kessel
 '89 200TQ, chipped and MOMO'd through out,
 in Tornado "arrest-me-officer" Red;
 '88 Fox, "the FOX machine";
 ex '85 5000s, "the EE's nightmare"
 Phila PA, USA
 a6561TB@gnn.com
  >>