Re: [Amc-list] Proportioning Valve

["Armand Eshleman" <aje1@xxxxxxxxxxxxxxx>]

Keith,

I can't tell you why your 70 Javelin doesn't stop as well as your 68 AMX,
without knowing the differences.
I can only tell you that my 70 Javelin stops fantastically compared to the
drum set up.
I don't recall my pedal being soft at all, however my new master cylinder
may have a lot to do
with that. If the master is weak then the whole system is "soft".

The push for a bit to grab may be
that the calipers are sticking or move slower, maybe your power booster unit
is weak. I have a fresh
rebuilt booster installed. I know I used to have difficulties with the old
booster and the drums doing
weird stuff like that. Always feeling soft and weak. If you have a stock or
near stock cam, I'd be
surprised if the vacuum is the culprit. If you have a rumpity rumpity cam
that could contribute.
The prop valve I bought was affordable, the factory used one on the 70
Javelin & AMX. Must be a reason............
The later models had a prop valve and brake failure alarm mechanism on the
firewall. I have the one from the Hornet,
but I didn't want to plumb in the extra line involved.
If the master cylinder doesn't balance the system on it's own, then it needs
the assistance of the prop valve.
Here's another one for you, are you still using the drum master cylinder? If
so it won't operate
the disc brake  the same way it does the drum brakes, so that could be the
problem.

Brien or Bruce or anyone, can you add to this??

Armand


----- Original Message ----- 
From: "Keith Evenson" <epd@xxxxxxxxxxxx>
To: "AMC/Rambler owners, drivers and fans." <amc-list@xxxxxxxxxxxx>
Sent: Thursday, October 25, 2007 10:28 AM
Subject: Re: [Amc-list] Proportioning Valve


> Armand, I also installed disc's on the front of my 70 Jav but I did
> not put in a prop. valve. I was advised at the time I did not need it.
> The disc's are better then the drums were but I also have a 68 AMX
> with factory disc's and it stops a ton better and faster then the
> Javelin does now. It just seems to be kind of a soft pedal if you
> know what I mean. Just seems like you have to push for a bit before
> they start to grab.  I have ok vacuum like 13 - 15lbs so it seems
> like that isn't the problem but do you know of any thing else that
> may help or does it sound like I need a prop. valve. I know it just
> balances the system so I don't think that is the problem. The other
> thing I was considering is a vacuum tank?
>
> Thanks Keith
>
> 55 Chevy Gasser
> 68 AMX
> 70 Javelin
>
>
>
>
>
> On Oct 25, 2007, at 9:51 AM, Armand Eshleman wrote:
>
> > Feltonik (real name?),
> >
> > Welcome to the list. I hope your experiences here will be as great
> > as mine.
> >
> > I have personal experience with this on my 70 Javelin. I converted
> > it to
> > front disc brakes from drums all around.
> > In 1970 model AMX and Javelins the factory installed a
> > proportioning valve
> > on the inside of the passenger
> > frame rail in front of the rear axle for disc brake equipped cars. The
> > proportioning valve is not installed on the all
> > drum setups. Since my car did not have the regulator I simply
> > purchased one
> > from Summit
> > http://store.summitracing.com/partdetail.asp?
> > autofilter=1&part=SUM2DG3905&N=700+4294922533+4294918719
> > +115&autoview=sku
> >
> > As I was replacing all the nasty looking brake lines I installed
> > the valve
> > in the factory location by fabricating a simple
> > bracket. I then bleed the system, bedded in the new pads, etcetera,
> > and
> > adjusted the valve until things were satisfactory.
> >
> > May I also mention that my disc brakes came from a 75 Hornet. I
> > purchased a
> > new master cylinder from NAPA for the
> > Hornet and installed it in my Javelin. The drum master cylinder
> > from your 70
> > AMX may not be adequate to operate the
> > disc brakes.
> >
> > Armand
> >
> >
> >
> > ----- Original Message -----
> > From: <feltonjk@xxxxxxx>
> > To: <amc-list@xxxxxxxxxxxx>
> > Sent: Wednesday, October 24, 2007 4:20 PM
> > Subject: [Amc-list] Proportioning Valve
> >
> >
> >> I am new to the list so forgive me if this subject has been addressed
> > already.? I am converting a 70 AMX from drum all the way around to
> > front
> > disc.? I have everything I need except the proportioning valve.? I
> > have?been
> > told everything from I don't need one, to buy an adjustable one
> > (but get a
> > brake professional to adjust it), to use the GM valve that was used on
> > vehicles such as the 70 Impala.? Any suggestions?
> >>
> >>
> >> _____________________________________________________________________
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