Hi Peter-
Yes my front piston (Called the "secondary piston" in the
instructions) "dropped" in quite easily. I suspect that the
bore may be tapered so that it gets narrower as you go in
although I can't be sure of that. Actually, I can tell you
that mine is probably tapered because of all that honing I had
to do...
Did you take apart your secondary piston assembly? I found it
to be a little difficult to get all the little parts back
together correctly. If the movement in the secondary piston
assembly is jammed, then that may cause a loss of pressure
to the back brakes. Since the primary and secondary piston
are coupled by a large spring, you might not be able to
feel or detect the jam.
Keep in mind that I'm totally guessing here. I'm sure that
someone else on the list has been there for real.
Good luck
'74 TR6
Peter Zaborski wrote:
>
> Steve,
>
> When you did your MC, did you notice if the front piston seal (the one which
> fits around the first piston you insert and looks kinda like a double O-ring)
> was giving you any kind of a tight fit. I am trying to rebuild mine and can't
> get my brakes to bleed even though there is no leaking. I suspec the reason is
> that this seal is not doing its job properly but I am not sure.
>
> I am putting in the main seal the way you describe. But when I insert the
>front
> piston on its own just to test it, it basically falls in. I checked the seal
> (the double O-ring one) I got with the kit against the original and the appear
> the same size. The main seal (the umbrella seal I think it's called) provides
>a
> very nice tight fit BTW.
>
> I am rebuilding my MC not because it didn't work but because my car has sat
> (indoors) for 8 years so it's just precautionary. The brakes worked fine when
>I
> parked the car 8 yrs ago (shame on me).
>
> Can you recall your experience with this double O-ring seal?
>
> Thanks in advance.
>
> Peter Zaborski, Calgary AB Canada
> 76 TR6 (CF58310 UO)
> peterz@merak.com
>
> ----------
> From: Steve Benelisha[SMTP:steveb@verity.com]
> Sent: Sunday, November 17, 1996 11:16 AM
> To: muntsb@HiWAAY.net
> Cc: triumphs@autox.team.net
> Subject: Re: More Brake MC Problems - 70 Spit
>
> Bill-
> I completed the MC rebuild on my TR6 and all came out to a happy
> ending. I was a bit worried because of the amount of honing I had
> to do remove the damage. The seals did not fit as tight as they
> otherwise would have. There are no leaks but I think that the overall
> life of my MC will be shorter than I'd like. The trick will be to keep
> dirt out - that should limit seal wear.
>
> As for your problem, If it is leaking a lot and the bore of
> your MC is in good shape, then all I can think is that perhaps
> your main seal is in backwards. I know you indicated that your
> seals were in correctly but I was about to put my main seal in
> backwards. I thought about it a lot and spent a lot of time
> looking at the crude drawings that came with the kit. And still
> was not 100% sure.
>
> The main seal, when correctly installed, should look like it's
> in backwards with the wide end facing towards the bore.
>
> Well, thats all I can think of, Good luck to you.
>
> -Steve
> '74 TR6
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