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From: clare on 18 Nov 2009 21:12
On Tue, 17 Nov 2009 15:14:11 -1000, dsi1
<dsi1(a)humuhumunukunukuapuapa.org> wrote:

>clare(a)snyder.on.ca wrote:
>>>
>> Disk brake calipers contain more fluid than drum brake cyls, and
>> require more fluid movement at higher pressure to provide the same
>> braking force, generally speaking. Therefore, disk brakes derive a
>> much grater advantage from power assist than servo type (like Bendix)
>> drum brakes. It allows you to get good braking pressure without
>> extreme pedal travel.
>
>I'm familiar with basic hydraulics but the fact remains that brakes used
>the same system of vacuum assist before disks became popular. It doesn't
>matter which system gets more benefit from power assist because the
>truth is that both drums and disks pretty much suck without it.
>
>>
>> Non Servo drum brakes like the old Chrysler Center Plane, girling
>> twinleading shoe, and GM Huck brake systems would have benefited
>> highly from power assist as well -and GENERALLY required either more
>> pedal pressure or longer pedal travel than the more common, recently,
>> Bendix style "self energizing" or "servo" brakes.


Big enough self energizing drum brakes do NOT NEED power assist.
Disk brakes DO - they are by nature NOT self energizing, and require a
lot of brake force. Not many disk brake cars, historically, without
power assist. And most Mopars built that way in the seventies have
had major front end damage at some time in their life. Used to be
impossible to find front end sheetmetal at the wreckers for them.
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