Jack :
0.75" is the correct bore. 0.70" will clearly work, since Triumph
switched to that size on the later TR4 (but someday, someone will curse
you as a DPO, when he/she tries to install a standard rebuild kit <g>).
I'd be reluctant to try the 0.62" on the street, 1st because I've never
felt the pedal pressure was too high (perhaps something else is wrong
?), 2nd because running out of travel at the wrong time can be most
unpleasant. Since the ratio is the square of the diameters, the 0.62"
master would have almost 50% more travel.
Randall
59 TR3A daily driver
Jack Brooks wrote:
>
> Scions,
>
> I am ready to purchase a $64.95 Girling Brake Master cylinder from the
> TrueChoice catalog for my post 60,000 TR3A. (Yes, they are Girlings and
> they are inexpensive.) They list three bores at 0.75, 0.70 and 0.62
> diameter. Can anyone clarify which one is the correct size? I have not yet
> pulled my old one yet, as it is just starting to fail.
>
> Also, has anyone used a smaller bore master cylinder to decrease pedal
> pressure? I realize the smaller bore will move less fluid per inch of pedal
> travel, requiring more pedal travel to exert the same braking force, but the
> difference should be OK, based on the allowable pedal travel remaining
> before bottoming.
>
> BTW - the Truechoice URL is http://www.truechoice.com or call 1-800-388-8783
> for a catalog.
>
> As always, thanks for your help,
>
> Jack Brooks
> 1960 TR3A
> 1974 Norton 850 Commando
> Hillsdale, NJ
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