Re: [FWDLK] Hissy Fitting (to be continued)

[David Homstad <dhomstad@xxxxxxxxxxx>]

Neil,

Not exactly. What Wayne is saying is that if 100% of the pedal pressure to
stop the car with non-power brakes is compared to PB, then the PB is 28% of
the manual pedal pressure. Roughly 1/4 th. So if the PB booster fails, you
have to apply 4 times the pressure. But then that is the normal pressure for
non-PB anyway.

Let's put it another way. If a fast stop requires 100 lbs of pedal pressure
with non-PB, then the same rate of deceleration with PB needs only 28 lbs.
If the PB booster fails, you are back to the 100 lbs. In a modern in-line
system, if the PB booster fails, you not only need the 100 lbs., but you
also have to compress the in-line spring and you need maybe 200 - 300 lbs.
to stop. Try it in a safe place sometime. Which is safer, the 50 year old
design, or the modern system?

Dave Homstad
56 Dodge D500

-----Original Message-----
From: Forward Look Mopar Discussion List
[mailto:L-FORWARDLOOK@xxxxxxxxxxxxx]On Behalf Of Eastern Sierra Adjustment
Svc
Sent: Thursday, July 24, 2008 1:03 PM
To: L-FORWARDLOOK@xxxxxxxxxxxxx
Subject: Re: [FWDLK] Hissy Fitting (to be continued)

SO, according to your research, the TOTAL assistance  provided by the
power brakes calculates to a 72% decreased pressure-
feel coming  from the booster, meaning that almost (72% extra) twice the
effort is required to stop a manual braked car?

That's a lot, when you think of it.

We've all got stories of having gotten used to a manual brake system
(really putting our foot into the brake pedal) and then
hitting the brakes on a power-boosted car!

I don't know if it's just Farts, but, my parents had a 65 Galaxie 500
convertible, and I also drove a 73-ish Continental,
and both cars had very-numb feeling power brake systems.

The power-assisted (mine, anyway) FWDLK'er has (had) a very nicely
modulated power brake system.

Neil Vedder





Wayne Graefen wrote:
> According to my research for the 300C,  28% of the application of
> brakes in the Chrysler power brake comes from the driver.  72% of the
> power is applied by the brake booster.  I presume these figures apply
> to all bellows type boosters and are similar to the canister booster
> which followed.
>
> Wayne G
>
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