Thought process starts at the wrong end!
The amount of fluid moved depends not on the MC but on the distance needed
to take up the slack at the shoes / pads. Changing to a 7/8 MC doesn't
effect that (but changing to front discs does)
As the piston in the larger MC moves more fluid the pedal travel is reduced
to achieve the same braking effect. Less likely that the pedal will reach
the floor before you achieve maximum braking! But the extra effort needed is
very small, hardly noticeable, especially when braking hard in an emergency
which makes it easier to lock the rear wheels.
Clutch overthrow and damage to the pressure plate can be a problem with
mis-matched components. Certainly on the later cars with separate clutch
cylinder matching a larger bore MC with an earlier, smaller bore SC, can
cause clutch overthrow.
Guy
-----Original Message-----
From: spridgets-bounces+guy.weller=tiscali.co.uk@autox.team.net
[mailto:spridgets-bounces+guy.weller=tiscali.co.uk@autox.team.net]On
Behalf Of Billy Zoom
Sent: 13 August 2008 23:27
To: ah53@yahoo.com; WFO Herb; brian james
Cc: Spridgeteers
Subject: Re: [Spridgets] 3/4" v. 7/8" MC
I'm taking a survey.
How many of you believe this to be true?
> The area of the 7/8" piston is about 36% greater than the area of the 3/4"
> piston. This means that the pedal effort required for clutch and brake
> operation is 36% higher with the larger cylinder. It also means that
clutch
> slave piston travel is 36% greater. The increase in required pedal effort
> constitutes a significant safety and drivability issue, and the increased
> slave piston travel can cause mechanical problems with the clutch linkage.
> www.brakecylinder.com/spridgetbrakes.htm
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