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Re: 10.1 brake question--The Truth! (long)
Then why is the Scirocco 16v master that I have and the 16v GTI master that
I have the same?
Dave
> In reference to the statement that the master cylinder on an A2 is larger
> than anything is incorrect (hows that for a run-on sentence). The bore
> diameter is the same (20.64mm) as a '79 Scirocco and even a '88 16V Jetta.
>
> Just had to clarify that one.
>
>
> Chris DeLong
> ICQ#45030867
> Seattle, WA USA
> '80 16V 'Rocco ragtop
> '91 GLi 2.0 16V
> '77 Rabbit 16V
> '80 'Vert (parting out!)
> '61 17 Window type II
> '91 Vanagon
> '78 Rabbit
> '78 Rabbit (for sale)
> '87 GTi 16V
>
>
>
> >From: Mash <type53@yahoo.com>
> >To: Dave Ewing <rabbit16v@prodigy.net>, Scirocco List
> ><scirocco-l@scirocco.org>
> >Subject: Re: 10.1 brake question--The Truth! (long)
> >Date: Mon, 22 Oct 2001 17:35:54 -0700 (PDT)
> >
> >--- Dave Ewing <rabbit16v@prodigy.net> wrote:
> > > I upgraded my rear discs and 10.1" brakes before
> > > doing the master cylinder
> > > and didn't have any problems.
> >
> >What year and model car?
> >
> > I did upgrade to the
> > > bigger master soon after
> > > that and the pedal did seem better but not
> > > dramatically.
> > >
> > > I also disagree with the proportioning valve ideas
> > > on the list. The
> > > proportioning valve restricts the amount of
> > > fluid/pressure going to the rear
> > > so as not to create an out of control rear lock up
> > > situation. On earlier
> > > cars (and some later) they have a level sensing
> > > proportioning valve
> >
> >Some have none - 1975-1980 Sciroccos . . .
> >
> >Are you sure that these are level sensing? My Bentley
> >specifically says "This proportioning valve is not
> >load-sensitive and cannot be adjusted" (ignoring any
> >Rabbit or Pickup applications).
> >
> > which
> > > will limit the amount of pressure/fluid going to the
> > > rear brakes based on
> > > the load in the car/truck. I have seen the small
> > > cylidrical looking
> > > proportioning valves on everything from Rabbit
> > > pickup 85 and newer golfs, 85
> > > and newer sciroccos, foxes, etc with no rear discs
> > > so there are different
> > > proportioning valves.
> >
> >yup . . .
> >
> > IF you are doing the upgrade
> > > on a Rabbit, use the
> > > Golf valves, if you are doing it on a scirocco, use
> > > the 16v valves.
> >
> >Why the difference? Same chassis, same weight
> >(roughly) . . .
> >
> >Dem 16V prop valves are rare and pricey and presumably
> >take into account those 10.1" front discs . . . If you
> >are doing the 10.1 front + rear discs then of course
> >the Scirocco 16V props are the only way to go (my
> >opinion)
> >
> > > Different valves on different cars have to be
> > > calibrated for different
> > > weights
> >
> >yup.
> >
> ><snip discussion on pickups>
> >
> > > Another thing I don't agree with is that you DON'T
> > > have to have the 16v
> > > pedal assy for this swap.
> >
> >Are they different than the 1985 & up Scirocco pedals?
> >
> > The 22mm master doesn't
> > > have an extra spot for
> > > the pressure switch usually used on older VWs for a
> > > brake light switch.
> >
> >Does not this also apply to the 1985 & up Scirocco?
> >
> > > Instead, it is an electrical switch on the pedal
> > > assy.
> >
> >Yup.
> >
> > > Be careful when upgrading to rear discs that there
> > > are two different kinds
> > > of calipers. There are A2 calipers that have the
> > > parking brake cable
> > > mounted at the bottom of the caliper and the
> > > Scirocco 16v calipers have them
> > > mounted on the top. The best way to tell is note
> > > where the bleeder screw
> > > is. Obviously the Scirocco 16v calipers are the
> > > nicer ones to upgrade to
> > > since the cables fit perfectly on all A1 cars
> > > (except pickup which is a
> > > breed of it's own) so you don't have to hunt or have
> > > some made. IF the
> > > bleeder is NOT ON TOP, THEY WON'T BLEED OUT!!!
> > > Don't ask why I know about
> > > this one!
> >
> >Problem with the design used on the Scirocco 16V and
> >early A2 cars is that the e-brake fails.
> >
> > >
> > > When upgrading to the bigger master you WILL need
> > > the bigger booster.
> >
> >If you don't already have it (1985 & up) :-)
> >
> > The
> > > "BIGGER" part that everyone is talking about is the
> > > bore, this means more
> > > fluid, more pressure so you couldn't use the smaller
> > > bore booster that your
> > > smaller bore master just came out of.
> >
> > Don't be fooled either,
> > > I believe that all A2s
> > > have the bigger master and booster so don't pay a
> > > butt load of money for
> > > this from someone else when they are a dime a dozen
> > > in the Pick A Part
> > > yards.
> >
> >True.
> >
> >
> > > Mostly just use your common sense. Realize that if
> > > there are prop. valves
> > > on 2000lb cars and 3500lb cars that they must be
> > > different!! They aren't
> > > all the same. Second, when getting "Suggestions"
> > > from someone, even on the
> > > list, question the source for reliability.
> >
> >Absolutely!
> >
> > I think
> > > we should voice our
> > > proof when answering a question like this too. I
> > > would trust someone that
> > > works at a dealership on VWs or a German auto shop
> > > more than I would trust
> > > someone who dabbles in their back yard
> > > (certifications help too) although I
> > > have known the backyard mechanic to be right before
> > > the Dealership mechanic
> > > also.
> >
> >Seen that too!
> >
> > And last but defineately not least, Bentley,
> > > Bentley,
> >
> >I love Bentleys but they don't help here :-)
> >
> >=== message truncated ===
> >
> >I guess that really was long!
> >
> >
> >=====
> >Mark Peele
> >1985 Scirocco, 1982 Scirocco, 1981 Scirocco, 1978 Scirocco, 1987 Golf GT
> >http://www.scirocco2.de/mark.htm
> >Direct Mail: SCIROCCO_GTX@YAHOO.COM
> >Need parts? try http://www.parts4vws.com/ (Potterman)
> >or http://www.germanautoparts.com/ (Adirondack)
> >or http://thescirocco.com
> >
> >__________________________________________________
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> >
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