Re: brake safety switch (proportioning valve)

["Jim Blair" <carnuck@xxxxxxxxxxx>]

Chances are if the reply begins with A: It's from me (I used it to send Q&A 
for students from years ago and it translated to the net when I used to post 
with Webtv, because people couldn't tell where my reply began or 
interspersed answers within replies were. Then it became a habit)
   If you open the valve up and remove the orings, it will still tell you 
when you have an issue of unequal braking pressure, as long as it's only a 
pressure differential valve. You'll have to keep a closer eye on fluid 
levels as any leak will drain both halves of the master.


From: "Armand Eshleman" <aje1@xxxxxxxxxxxxxxx>
To: <mail@xxxxxxxxxxxx>
Subject:  Re: brake safety switch (proportioning valve)
Date: Tue, 31 May 2005 22:05:04 -0500

First of all I apologize to the person who responded with the e-mail
following. After I
posted the first one, I lost the author of this response and then for the
life of me I couldn't remember who wrote this !!! Gosh I love my senior
moments.

Anyway, I haven't been able to find any PBR around here because well frankly
there
may be as many as two British cars in my city. My hometown is full of
Tuners.
And to top all of this off I found out I'm in pretty deep with this
conversion and rapidly
running out of answers.  I found a rebuilt power booster for disc brakes and
got it here
now but then discovered the brackets are different on the drum power booster
versus
the disc power booster. I am looking for the brackets now. Russ H from
Oregon please
look for a e-mail coming to you regarding this problem.
I do have the proportioning valve from the disc brake donor car but if it's
in the same
condition as the one originally in my 70 Javelin I'm gonna be a hurtin unit.
It also requires
a brake line change from the original configuration. (not really a problem
just takes more time)
The easy route might be to locate a proportioning unit or equivalent to what
was factory on 70
Javelin/AMX. Apparently this part is found under the chassis near the rear
axle, and is unique to
power disc brake equipped AMCs. Maybe the summit unit mentioned in the
e-mail message below
is the answer. I guess I need to put my thinkin cap on and figure this one
out.
I'm open for advice/suggestions.........
Thanks,
Armand






A: Since it's not a real prop valve, I would switch it for one from a disc
brake system, or get an aftermarket adjustable one from Summit ($35 average
on Evilbay) The common Jeep fix is to take the o ringins off and lube the
piston lightly with PBR rubber grease (available mostly in Brit car
enthusiasts shops) as it is the ONLY assembly lube I know of that is
compatible with brake components. If there is another, I'd like to hear
about it. I'm about to dive into modifying the brake system in my Comanche
because the load level sensor makes it brake erratically since my 6" lift

and 33" tires.