Where to start?
1. If the diameter is doubled, the area of the slave piston is
quadrupled, so the 1:1 movement becomes 4:1.
2. As Barney suggested, people don't push the pedal a fixed distance.
Instead, they push it until they get the appropriate pressure. With
larger slave cylinders, they will push the pedal further and more
fluid will flow into the rear slave cylinders. For the same pressure
in the primary (which equates to approximately the same braking force,
since most of the braking is at the front), there will be more force
applied to the rear brakes.
Paul H explained that the pistons in the master cylinder are arranged
to equalize pressure in the front rear. If it takes more fluid to get
the pressure to equalize with larger rear slave cylinders, then more
fluid will flow into the rear circuit.
On Thu, Feb 26, 2009 at 10:11 PM, Charles & Peggy Robinson
> Charles & Peggy Robinson wrote:
>> I'm sorry Barn, but I can't agree. Look at it. If the master and the
>> slave were the same size, the slave would move the same amount as the master
>> for a given displacement and the force would be 1 to 1 If the slave was
>> twice the diameter of the master, the force at the slave would be doubled
>> but the travel would be halved.
>> Barney Gaylord wrote:
>>> At 03:22 PM 2/25/2009 -0600, Charles & Peggy Robinson wrote:
>>>> I'm aware that if you increase the size of the slave cylinder you get
>>>> more force multiplication but less movement for a given displacement of the
>>>> master piston. That's all I said.
>>> 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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