PROPORTIONING VALVES on 16v

[amalventano at sc.rr.com (Allyn)]

the numbers are actually different than that. the brake cylinders are
different diameter front/rear, and the brake rotors are different diameters
front/rear, so the prop valves may not be doing a perfect 70/30 split in
hydraulic pressure, they just do the correct split (whatever that may be) so
the end result at the wheels is the desired split in braking force.
also, prop valves are set up considering the car is in a braking condition,
so this weight distribution turns into something like 85/15 or 90/10 (in
extreme cases), as weight shifts from rear to front as you brake.
Al

----- Original Message ----- 
From: "toFUNit@yahoo.com" <tofunit@yahoo.com>
To: <scirocco-l@scirocco.org>
Sent: Wednesday, July 16, 2003 12:11 PM
Subject: RE: PROPORTIONING VALVES on 16v


> To respect the ratio 70% front - 30% rear?
>
>
> --- ATS - Patrick Bureau <txrocco@sbcglobal.net> wrote:
> > the proportioning valves are to limit the amoutn of pressure sent in
rapport
> > to the front in variation to the amount of pressure applied to the brake
> > pedals, to limit the amount of pressure sent towards the rear, thus
> > preventing wheel lock up and keeping the braking ration to oem specs .
> >
> > ATS - Patrick Bureau - txrocco@sbcglobal.net
> > ----------------------------------------------
> > MSN:ATSGTX@hotmail.com |YAHOO:ATSGTX@yahoo.com
> > ICQ:32918816           |AIM:Texasscirocco
> > ----------------------------------------------
> >
> >
> > =>-----Original Message-----
> > =>From: scirocco-l-bounces@scirocco.org
> > =>[mailto:scirocco-l-bounces@scirocco.org]On Behalf Of Drew MacPherson
> > =>Sent: Wednesday, July 16, 2003 9:51 AM
> > =>To: Anson Clement
> > =>Cc: scirocco-l@scirocco.org
> > =>Subject: Re: PROPORTIONING VALVES on 16v
> > =>
> > =>
> > =>
> > =>Bollocks...!! :)
> > =>
> > =>On the Mk2 Scirocco ETKA calls the vlaves on the 8V and 16V brake
pressure
> > =>regulators (pressure sensitive.)  Early A2 Golfs are called "load
> > =>sensitive"  pressure regulators.   Late Golfs and all A2 (and A3 etc.)
> > =>Jettas have load sensitive pressure regulators that are tied to the
rear
> > =>axle beam and vary rear brake pressure based on weight on the rear
axle.
> > =>
> > =>Rear brake shoes on our cars are self adjusting - there's a spring
loaded
> > =>wedge in the linkage that keeps the brake lining an optimal distance
from
> > =>the drum at all times.
> > =>
> > =>So, as much as I'd like to believe it, Anson, I don't think it's
> > =>true...:)
> > =>The 8V valves are pressure limiting the same as the 16V ones are, only
> > =>allowing (probably more) pressure through.
> > =>
> > =>That's my story, and I'm sticking to it.
> > =>
> > =>Drew
> > =>
> > =>On Wed, 16 Jul 2003, Anson Clement wrote:
> > =>
> > =>> To the best of my knowledge the "proportioning valves" mounted on an
> > =>> 8v's master cyl are actualy some sort of check valve. The porpose of
> > =>> these wee little bundles of joy is said to be keeping good pedal
> > =>> feel/preventing the shoes from retracting too far from the drum.
> > =>>
> > =>> correct/slap me if I'm wrong :)
> > =>>
> > =>> Anson
> > =>>
> > =>
> > =>--
> > =>/=============================================\
> > =>|  84 Wolfsburg Edition TurboDiesel Scirocco  |
> > =>|    http://scirocco.cs.uoguelph.ca/gtd       |
> > =>\=============================================/
> > =>
> > =>
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