RE: [ST] Brakes and Tires, Again!

["colt4530@xxxxxxxxxxx" <colt4530@xxxxxxxxxxx>]

Andrew, 

Where would the air go?

Most likely the seals are somewhat (designed to be?) self-retracting, like
those in GM sports cars.  Pushing the pistons in and pumping them out, or
leaving pressure on for a long time pushes the piston out until the pad
makes solid contact with the disk.  With solid contact the M/C doesn't have
to pump much fluid thus remaining firm for a while.  As the pads wear a
bit, the seal flexes the 0.010" required to brake, but then pulls the
piston back after the lever is retracted.  The flex requires the lever move
more to pump more fluid to take up the space left by the 0.010" gap.

The benefit is less parasitic drag from the brakes when they are not used.  

John Albright 

Original Message:
- -----------------
From: Andrew F. Kay, Jr. captainquack@xxxxxxxxxx
Date: Wed, 25 Aug 2004 13:09:36 -0400
To: ST@xxxxxxxxxxxxxx
Subject: RE: [ST] Brakes and Tires, Again!


One explanation I've heard is that it forces air "dissolved" in the
fluid out.  I have no way to verify this, but the system works.

Andrew F. Kay, Jr.
Riders of the Lost Empire, LC,  13355 79th Street, Fellsmere, FL 32948
www.lostempire.com   andy@xxxxxxxxxxxxxx 
"One man that has a mind and knows it, can always beat ten men who
havent and dont." George Bernard Shaw, 1856-1950. The Applecart, (1929),
Act I.



- -----Original Message-----
From: owner-st@xxxxxxxxxx [mailto:owner-st@xxxxxxxxxx] On Behalf Of Mike
Montville
Jean,

What I meant was that I realize "how" you do this, but don't understand
the physics of "why" it works.



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