[s-cars] Brake Pedal to the floor w/ ECS Stage II and RearSlotted

[Richard Tanimura]

Keith,

Thanks for rectifying that. I never thought to measure the G60 pistons -
just assumed. Baad habit.

Do you know off hand what the stock F/R brake bias is for S-cars?

Rich

-----Original Message-----
From: Keith Maddock [mailto:Keith.Maddock at TRW.COM]
Sent: den 20 oktober 2003 12:14
To: s-car-list at audifans.com; cpayne at bconnected.com;
richard at tanimuras.com
Subject: RE: [s-cars] Brake Pedal to the floor w/ ECS Stage II and
RearSlotted


Actually, the Big Reds have smaller net piston surface area than the Stock
G60's.

G60's have two pistons with the same effecitve size as an about 60mm piston.
(hence the name)

Big reds have 36mm and 44mm pistons, same effective size as an about  57mm
piston.

Smaller P-Brakes (Boxter) have even smaller effective piston sizes.

On top of that they are stiffer, which means in the end they need less
fluid, not more, since the bridge doesn't flex as much.

The extra braking power of "Big Reds" or other P-Brake based upgrades is not
from the caliper size, it's from the increase in rotor size (which also
provides fade resistance).  The benefit from the caliper is improved pedal
feel and fade resistance since they are stiffer.

Cody, do you have a S4 or a S6?

On a semi-related topic, I'm with Leigh on the Big-Rear-Brakes - completely
unecessary for performance.  I find my UrS4 (ECS Stage II at front) to be
almost over-braked at the rear.  If you have even larger front rotors, then
it's possible you need to bias more brakes to the rear, but in this case I'm
pretty sure a adjustable bias valve will give you all the extra rear braking
power you need, much cheaper than Big Reds and the associated parking brake
hassles.    They do look good though :-)

Cheers,
Keith

Keith Maddock, TRW Automotive,  Koblenz, Germany
Slip Control Systems, Systems Design, Traction Control
+49 (0)261/ 895 2474    -   -   keith.maddock at trw.com


>>> "Richard Tanimura" <richard at tanimuras.com> 08:25:20 19.10.2003 >>>
Maybe you need another master cylinder. Bigger brakes = bigger pistons =
more volume of fluid moving when you brake, no? Bigger volume = more pedal
travel.

Rich

-----Original Message-----

[mailto:s-car-list-admin at audifans.com]On Behalf Of Cody Payne


Gents,
	I love the Big Red kit...and w/ Hap's latest post I am even more jealous.
However the question I have is in regards to my brake pedal...I can depress
it ALL THE WAY and be nearly on threshold braking...but I can NEVER lock up
the brakes w/ my R4-S Pads and stainless steel lines.  Is this normal?  It
is not brake fade and I am not aware of any air in the brake lines (Super
Blue Fluid)

Can anyone else running ECS Stage II w/ similar pads lock up the wheels?
http://www.audifans.com/mailman/listinfo/s-car-list
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