Re: [FWDLK] AAJ Brake kits

[cpollock@xxxxxxxx]

Hello All,
Just wanted to give you a quick heads up on the proportioning valve on Chrysler
vehicles.  Actually every car body line had it's own valve, not every car.  So
the B-body line had one PN, the A-body another and the C-body a third.  The
exception was Hemi cars.  Any Hemi, regardless of the body used the same
valve.  This was because the valve was VERY close the exhaust manifolds, so the
special valve had it's own built on heat shield.  Note that this is only true
of the muscle era cars.  I don't know about our FL cars, though I imagine this
should be true as well.  Chrysler did switch to a across the board valve in the
80's when everything became a K-car.  This is also why Mopar Performance builds
a adjustable proportioning valve.  These are very handy when you switch to
different master cylinders with different rear brake cylinder diameters and
larger front disc brakes.  This is a conversion I have done on all of my
Chargers when I build them as drivers.  Most of the Mopar magazines have
covered it at one time or another.  So, if it were me, I would get one of the
adjustable valves and use it on the conversion on your FL car.  This would
allow you to adjust your brakes precisely for your car and avoid the GM stuff
entirely.  If you don't want to go this route, I would just grab one off of any
early 70's C-body (New Yorker, 300, Fury III, Imperial-watch out on this one,
1974 cars had REAR discs, different valve, etc.)  These cars were just about
the same size as our beloved FL cars.  Plus there are tons of them in the bone
yards with parts for cheap!

Just my pennies,
Chargin'Charles--->>>

Dirt Rider wrote:

> Actually I find this a very interesting thread. So if all proporting
> valves/combinating valves are made for different cars, based on wheel cyl
> size, weight, etc.
> How can this be true (and I went to the AC Delco Site to see for my self). A
> fellow list member emailed me this
> We are in the process of installing the kit. We decided to go with a
> combination valve from a GM car. Supposedly this would make the part easier
> to find, because the same valve was used on nearly every disc/drum GM from
> 1973-1990. The AC-Delco part was 172-1353. Go to their website and search
> for that
> part, you can see just how many heavy cars was used on. From what I
> understand you can use a combination valve from just about any disc/drum car
> as long as the size/weight of the car is close.
>
> I looked the part number up and it fist just about everything from a 83
> Buick Regal to a 1991 3500 series (1 ton) pickuptruck.
> It's pretty obvious that those vehicles are nowhere near the same size.
>
> So explain it to me how this could be.
>
> Nick
> ----- Original Message -----
> From: Al Toews <al@xxxxxxxxxxxxxxxx>
> To: <L-FORWARDLOOK@xxxxxxxxxxxxx>
> Sent: Friday, February 15, 2002 7:59 PM
> Subject: Re: [FWDLK] AAJ Brake kits
>
> > I agree. Those elements you mentioned have to work together as a system
> and
> > are tuned during original design/development. Without an 'adjustable'
> > proportioning valve, if your braking system stays balanced after modifying
> a
> > system element, buy a lottery ticket. Good luck has been with you.
> > On my 60 Dart, I installed disks upfront and larger drums on the rear. The
> > adjustable proportioning valve is in the line going to the rear drums. The
> > knob(underneath my seat)is easily assessable and takes some pressure of
> the
> > drums for even stops.
> >
> > Cheers!
> > Al
> >
> > -----Original Message-----
> > From: Forward Look Mopar Discussion List
> > [mailto:L-FORWARDLOOK@xxxxxxxxxxxxx]On Behalf Of Tom Stroup
> > Sent: Friday, February 15, 2002 2:37 PM
> > To: L-FORWARDLOOK@xxxxxxxxxxxxx
> > Subject: Re: [FWDLK] AAJ Brake kits
> >
> >
> > Brakes are tricky things to get to work correctly.
> >
> > Proportioning valves work with set parameters
> > that are known by the car builders... like front
> > and rear weight, wheel cylinder sizes, front disk
> > size, etc.  You could buy a real adjustable valve
> > from an aftermarket place like Summit Racing,
> > for example, and fine tune YOUR system to
> > your vehicle.
> >
> > The fixed valves from specific
> > models may not do what you wish.  Check out
> > a Chrysler parts book and you will find there
> > were many proportioning valves, each to fit a
> > certain situation.  In general, you might be OK
> > with what you install.  It is kinda like insurance.
> > All car insurance is good until you need it.
> >
> > At least try it out on a lightly graveled parking
> > area to see which end locks up first, before you
> > throw the family in and go for a highway run
> > on a rainy day.  The question is:  If it doesn't
> > work like you think it should, how will you
> > fix it?
> >
> > Just my two cents,
> > Tom                  1957 Dodge in southern Ohio
> >
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Calendars are still available.  Don't miss the chance to get yours now!
Details for ordering may be found at:
http://www.forwardlook.net/calendar2002/index.html