[Fot] dual circuit brakes on a tr4

[Joe Curry]

Unfortunately, unless you go to a different brand master cylinder, there are
no options for Spitfires.  The clutch and single circuit brake master
cylinders have the same bore. But it does work pretty well as long as you
remember that more effort is required.

Bill B's comment about using the same size bore for both clutch and brake
master cylinders is "Spot On"  Keeps things simple.

Joe C.

----- Original Message ----- 
From: "Greg Solow" <gregmogdoc at surfnetusa.com>
To: "Joe Curry" <spitlist at cox.net>; <WEmery7451 at aol.com>;
<markvaden at gmail.com>; <fot at autox.team.net>
Sent: Friday, November 02, 2007 12:06 PM
Subject: Re: [Fot] dual circuit brakes on a tr4


> The pedal effort required to operate the brakes is determined by the area
of
> the master cylinder or cylinders in relation to the area of the wheel
> cylinders or caliper pistons. So using two master cylinders of the same
size
> gives WAY more piston area and the effort required will go up damatically.
> When we put a Tilton balance bar setup on Bill Fink's Morgan SLR a number
of
> years ago we used two 5/8" masters and that still required more pedal
effort
> than the stock single 3/4" master that a Morgan uses. I understand that
> someone, possibly Wilwood now makes 9/16" Master cylinders. They would be
> closer in total piston area the a singe 3/4 or .700" master.