Re: 4kq brake master cyl upgrade

["Doug Johnson" <ur-quattro@msn.com>]

----- Original Message -----
From: Doug Johnson <ur-quattro@msn.com>

> ----- Original Message -----
> From: Gerry Snow <gsnow@iea.com>
>
> > Is anyone aware of a good upgrade to the brake master cylinder on my 84
> > 4000q?  I have heard something about fitting a larger piston bore master
> > cylinder from a 5kq, 200, or maybe from an 80/90.
> > I want to achieve a shorter pedal stroke and a harder
> > pedal for better heal and toe use on the race track.
>
>
> You're correct about a larger diameter master cylinder providing a shorter
> throw at he pedal, because the volume of fluid displaced to move the
caliper
> pistons (hence, the distance the caliperr pistons move) remains unchaged.
> Your proposed diameter increase will result in a decrease in required
travel
> for the same braking effect.  However, the force you will need to impart
> upon the brake pedal (with your leg!) is proportional to the master
cylinder
> diameter.

Area, Doug....it's proportional to the master cylinder AREA!!!