<VV> power brakes

[James Davis]

Almost all disk brake caliper piston(s) have a greater piston area than 
drum brake wheel cylinders.  This necessitates a larger master cylinder 
piston diameter (1 inch on drums and 1.125 on disk) to achieve the same 
brake petal movement to apply the brakes.  Thus, a power brake unit to make 
up for the increased petal pressure to apply disk brakes (about 25% greater 
than drums).
Jim Davis

  At 01:31 PM 9/6/2004, you wrote:
>Nick, boosters are often necessary when disc brakes are used.  Duo-servo 
>drums brakes (like those used on Corvairs) are self-energizing and require 
>much less pedal force to create the same braking torque created by disc brakes.
>
>Charlie Morgan
>Beaver State Corvairs
>
>At 06:47 PM 9/5/04, Nick Elzinga wrote:
>>...I disagree with Tim's comment "Who needs
>>'em?"  Every modern car has a booster, so why not a Corvair? ...
>____________________________________________