You get slower movement of a larger slave piston for given *rate* of pedal
movement. And you get less movement of a larger slave piston for a given
*amount* of pedal movement, the two are inextricably linked. That is why you
get a longer pedal travel with a larger slave piston in order to take up a
given amount of free play in the drums. But it is irrelevant. Braking only
starts once whatever free play there is in the system has been taken up at
which point very little additional fluid is displaced as pressure in the
system and hence retardation rapidly rises. All this started from the
incorrect assertion that a *smaller* cylinder diameter gave more braking
effort, long ago corrected.
PaulH.
----- Original Message -----
You never get less movement. You get slower movement, more fluid
flow, and longer pedal travel until the shoes move the same distance
to come into contact with the drum. When it stops moving you get
higher force from the hydraulic pressure on the larger piston. Ergo,
more braking force on the rear wheels and possible rear wheel lockup
(after longer pedal travel).
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