Classic Mustangs List Archive

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Mail From: TXarsoncop ((email redacted))

In a message dated 2/25/2004 9:05:21 AM Central Standard Time,
(email redacted) writes:
Your missing a fundamental function of the distribution
block as your calling it, as in, proportioning valve.
As usual, I left some important stuff out of my original post... I will try
to clear up some things.

I have the original braking system on my '64.5. The single bowl MC has 1
output for the brake light switch (NOT a brake warning light) and 1 output line
to the distribution block (1 input, 3 outputs) which outputs to _all_ brakes,
front & rear. I've lost brakelines before, believe me, there is no "shuttle
valve" or anything else in these distribution blocks. Break 1 line anywhere and
all brake function ceases to exist.

Now, what I'm planning to do is run a brake line from the new dual bowl MC
rear bowl to the original distribution block and use that to ouput to the L & R
front brakes and the brake light switch (not warning light). Then I'll run
the line from the front bowl of the new MC directly to the rear brake line.

I shouldn't need a "shuttle valve" since the two circuits will be completely
separate and 1 circuit will continue to work in the event of a line break...
right?

Thanks to EVERYBODY who's been trying to help so far!!

bill
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Mail From: walt.boeninger (Walt Boeninger)

NO! You need a shuttle valve.

The master cylinder relies on fliud pressure between the
two separate reservoirs. They are NOT truly as independent
as you think. The master cylinder will not work with
only one side filled.. you want to keep the fluid in
both sides, hence you need the shuttle valve to "seal"
the open(leaking) side and maintain braking ability
in the other.....

Walt
----

(email redacted) wrote:
>
> Now, what I'm planning to do is run a brake line from the new dual bowl
> MC rear bowl to the original distribution block and use that to ouput to
> the L & R front brakes and the brake light switch (not warning light).
> Then I'll run the line from the front bowl of the new MC directly to the
> rear brake line.
>
> I shouldn't need a "shuttle valve" since the two circuits will be
> completely separate and 1 circuit will continue to work in the event of
> a line break... right?
>
> Thanks to EVERYBODY who's been trying to help so far!!

This read-only message was archived from a public mail list.
Mail From: james.w.butler ((email redacted))

Had a wheel cylinder go out on the front of my 68 coupe. Lost all fluid in the rear bowl. dry as a bone. The rear brakes worked the rest of the way home. Got there checked the MC and the front bowl was still full. (Was not fun to drive it, had to plan the stops really well. Took a lot longer)

----- Original Message -----
From: Walt Boeninger <(email redacted)>
Date: Wednesday, February 25, 2004 12:00 pm
Subject: Re: [CM] Clarification was Re: brake line flaring

> NO! You need a shuttle valve.
>
> The master cylinder relies on fliud pressure between the
> two separate reservoirs. They are NOT truly as independent
> as you think. The master cylinder will not work with
> only one side filled.. you want to keep the fluid in
> both sides, hence you need the shuttle valve to "seal"
> the open(leaking) side and maintain braking ability
> in the other.....
>
> Walt
> ----
>
> (email redacted) wrote:
> >
> > Now, what I'm planning to do is run a brake line from the new
> dual bowl
> > MC rear bowl to the original distribution block and use that to
> ouput to
> > the L & R front brakes and the brake light switch (not warning
> light).
> > Then I'll run the line from the front bowl of the new MC
> directly to the
> > rear brake line.
> >
> > I shouldn't need a "shuttle valve" since the two circuits will
> be
> > completely separate and 1 circuit will continue to work in the
> event of
> > a line break... right?
> >
> > Thanks to EVERYBODY who's been trying to help so far!!
>
> _______________________________________________
> Classic-mustangs mailing list
> (email redacted)
> lists.twistedpair.ca/mailman/listinfo.cgi/classic-mustangs
>

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Mail From: TXarsoncop ((email redacted))

In a message dated 2/25/2004 12:21:52 PM Central Standard Time,
(email redacted) writes:
The master cylinder relies on fliud pressure between the
two separate reservoirs. They are NOT truly as independent
as you think. The master cylinder will not work with
only one side filled.. you want to keep the fluid in
both sides, hence you need the shuttle valve to "seal"
the open(leaking) side and maintain braking ability
in the other.....
And my eyes were opened. Thanks Waln now I understand! Nobody had written
it (or more likely _I_ hadn't read it) as clearly for me. You guys are the
best for putting up with my ignorance!

bill
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Mail From: rrobaldo (Lance Robaldo)

Actually, the dual MC WILL work with only one bowl, but you'll have to push
the pedal further before you get braking.

There are two pistons in the dual MC. Under normal conditions, they have a
small amount of fluid between them. but if you have a leak in the "rear"
cylinder (front brakes), the fluid between the pistons will leak out and the
rear piston will have to travel further before it starts pushing the front
piston. This will give a spongy pedal, but you will still have brakes and
the MC will still function as it should.

If the "front" cylinder (rear brakes) fails, then you won't have any further
to push the pedal, but you will, naturally, lose the rear brakes and only
have the front, again giving the brakes a spongy feel..

That being said, I do agree with Walt and recommend you use the shuttle
valve. At most, it provides an extra measure of safety and can help keep
the pedal firmer. At the very least, it provides a way to have an indicator
when EITHER of the brake circuits fails.

Lance.


----- Original Message -----
From: "Walt Boeninger" <(email redacted)>
To: "A list for owners of Classic Mustangs"
<(email redacted)>
Sent: Wednesday, February 25, 2004 1:00 PM
Subject: Re: [CM] Clarification was Re: brake line flaring


> NO! You need a shuttle valve.
>
> The master cylinder relies on fliud pressure between the
> two separate reservoirs. They are NOT truly as independent
> as you think. The master cylinder will not work with
> only one side filled.. you want to keep the fluid in
> both sides, hence you need the shuttle valve to "seal"
> the open(leaking) side and maintain braking ability
> in the other.....
>
> Walt
> ----
>
> (email redacted) wrote:
> >
> > Now, what I'm planning to do is run a brake line from the new dual bowl
> > MC rear bowl to the original distribution block and use that to ouput to
> > the L & R front brakes and the brake light switch (not warning light).
> > Then I'll run the line from the front bowl of the new MC directly to the
> > rear brake line.
> >
> > I shouldn't need a "shuttle valve" since the two circuits will be
> > completely separate and 1 circuit will continue to work in the event of
> > a line break... right?
> >
> > Thanks to EVERYBODY who's been trying to help so far!!
>
> _______________________________________________
> Classic-mustangs mailing list
> (email redacted)
> lists.twistedpair.ca/mailman/listinfo.cgi/classic-mustangs