Single brake line to rear ok?

[jdbubb at ix.netcom.com (Dan Bubb)]

Back in the day VW made a big deal about the "dual diagonal" braking system. 
The typical solution is to have a rear brake and a front brake circuit. On 
front drive cars because of the heavy front weight bias if the front circuit 
failed and only the back brakes were operating you'd have on hell of a long 
stopping distance (and probably sideways with the backs locked).
So, one front, one rear so the car would still stop in a reasonable distance 
if one circuit failed.
And, of course, you don't want both brakes on one side since that would 
pitch the car sideways also.
So, one front and the opposite rear for some semblance of balanced braking 
with a failure.
In any event you do not want to interconnect the two braking circuits cause 
if one fails they both fail!
And each circuit should have two brakes connected to it.
So, I'd hook it up like VW did from the factory with two separate 
proportioning valves.
Don't know how the Audi gets away with one line to the rear. Either they 
have a front circuit, rear circuit setup or it has some interaction with the 
all wheel drive.
That's my long winded .02!
Dan

----- Original Message ----- 
From: "Mark F." <mk1mark@gmail.com>
To: "Scirocco-L" <scirocco-l@scirocco.org>
Sent: Saturday, May 07, 2005 3:22 AM
Subject: Single brake line to rear ok?


I'd like to install an adjustable proportion valve inline to the rear
brakes on my 75 track/street car (which has a full 16v brake system).

Can I just run one brake line to the rear, and "T" it off to both rear
brakes (after the prop valve)?

My Audi CQ comes like this from the factory...

Would I "T" both rear lines just off the master cylinder to a single
line, or use one rear line and cap off the other (at the MS)?

Any input is much appreciated...

Thanks!

Mark.

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