Jack,
Inasmuch as HSR requires a dual master cylinder brake system, I went
through a couple of painful experiments to qualify. The first two attempts
were home-spun bias bar contraptions which never seemed to work
predictably. The third system turned out to be pretty straight forward.
We installed a power boosted TR-6 master cylinder with no modifications to
either the master or wheel cylinders. This system has been flawless in
operation.
Richard Taylor
TR-4
Atlanta
At 12:18 PM 10/6/1999 -0400, Jack Brooks wrote:
>Amichi,
>
>As my current master cylinder is beginning to fail, I am considering
>changing (upgrading) my TR3A from a single brake master cylinder to a dual
>system for safety considerations. I am trying to do it as a bolt in,
>without having to change sheet metal.
>
>My research has indicated that the Late (1500) Spitfire and MGC brake
>masters cylinders are potentially good candidates. Both of these are tandem
>cylinders, with one seal behind the other in a common bore and share the
>mounting flange of the TR3's Girling cylinder.
>
>It appears that the MGA brake/clutch cylinder can be rebuilt into a dual
>brake master. From what I can tell, it will fit in the space my single bore
>brake cylinder occupies. I think (aside from having MG designated Girling
>parts in my TR3A) the MGA system sounds like a winner because it is a true
>dual bore system. I hope to have one of these in my hands this weekend to
>check fit up, when I replace my failing single master cylinder.
>
>I'd anticipate using the stock "tin can" reservoir, split between braking
>systems, with the clutch picked up on one of the circuits, or with a
>separate reservoir, but haven't really thought this out yet. First I need
>to find a master cylinder that will fit.
>
>Does anyone know what setups have been used, or done one?
>
>Thanks,
>
>Jack Brooks
>1960 TR3A Street/AutoX
>1974 Norton 850 Commando
>Hillsdale, NJ
>
>
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