Dan,
The reason the Installation of front disk brakes does require
installation of a dual master cylinder:
Drum brake systems are designed to hold some residual pressure at
the wheel cylinders to reduce the reaction time and pedal travel against the
brake springs. This is done in the master cylinder with a check valve. Disk
brakes have no retraction springs and any residual pressure will result in
constant light pressure of the disks against the rotors. Dual masters are
different for drum/drum, disk/drum, and disk/disk systems.
Dave Homstad
56 Dodge D500
On Thu, Aug 7, 2014 at 11:35 PM, Daniel Davids
wrote:
Installation of front disk brakes does NOT
require installation of a dual master cylinder.
What IS required is a means of balancing the braking power between
front and rear, because you’ve massively changed the pressure and response
characteristics of the front system.
This is accomplished simply by putting an adjustable proportioning
valve between the front and rear lines. Cheap and available through Summit
Racing, JEGS, or whomever. In the case of cars that came with
factory-installed disk brakes, there is a proportioning block, which does the
same thing as the aforementioned valve, except that it is not adjustable. The
engineers figured out the correct orifice sizing for that particular car and
spec’d it for manufacture.
I used to drive formula race cars which had a driver-controllable
brake proportioning valve. The master cylinders were single.
Dan Davids
Thanks, Dave; the English tea cookie is also shown.
Then, the owner still has to re-plumb the brake system....and
put-up
with the Dualie's appearance, once it is installed.
All for what purpose?
A Dualie is not going to improve any braking response/reaction,
but, if
someone is installing disc brakes, a Dualie is a necessary evil.
I get that, and it's part of the protocol.
You want to do something good for your car's braking?
Replace its TIRES with new ones.
Tires, for the past few years, have been built with
life-expectancies of
about 6-8 years.
How about THIS for a new thread???
Bias ply -vs- radials!!!
Neil Vedder
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