When considering fluid power (hydraulic brakes) The work is done by pressure
not by distance. This is not the true definition of work i.e. Force X
Distance, but is what we are considering. If the small cylinders move out more
rapidly under pedal application, so what! The resistance to movement, when the
shoes hit the drums, will result in a build up of pressure that will extend
any sluggish members (front caliper pistons perhaps). When all the free play
is taken up, then the real pressure will build, and the work of stopping can be
done.
If the wheel cylinders are smaller, the resulting braking force may be smaller
(do not neglect the self energizing effect of the leading shoe) and there will
be less pedal travel before the brakes start to "bite", A higher pedal action.
Mechanical adjustment of the pedal linkage can reposition the pressure point of
the pedal if desired.
Please do not construe this as an endorsement for the exchange of wheel
cylinders! I do not know what the results will be. I just want to make clear
the nature of the system.
Regards
Calvin Grandy
Vermont
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> From: SRL311KA@aol.com
> To: toby@wolfenet.com; datsun-roadsters@autox.team.net
> Subject: Re: Rear Brake Swap
> Date: Tuesday, November 23, 1999 10:24 PM
>
> Hey list,
> Pistons in smaller rear wheel cylinders will move further than larger
> cylinders with the same amount of pedal depression. Think about it!
>
> Bill Kenyon
> SRL311 KA
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