My educated guess might be that the pushrod on the brake side of your
master cylinder had an O ring fail to move a little upon braking and not
allow the fluid to return to the master as a bleed off type of effect.
While installing a new master cylinder and adjusting the throw on the
brake pushrod I found if you misadjust that rod you get an almost rock
solid pedal with no movement.
Just a guess from here.
Alan
Evangelos G. Makris wrote:
> Well, this was really weird and scared me quite a bit!
>
> During my regular weekend Sprite trip I parked it and
> turned it off for 5 minutes. When I went back and
> started it back on the brake pedal was totally unmovable!!
>
> It only lasted for a few seconds because I gave it
> two or three slight pushes and then it moved, reluctantly
> at first, OK later. The brakes worked in their usual way
> afterwards.
>
> I didn't leave the car out of sight and I haven't lost
> a drop of brake/clutch fluid since November. Yes, I
> spray grease the pedal joints regularly.
>
> My Mk3 Sprite has the combination brake/clutch master cylinder.
>
> Is this normal? Has it ever happened to you? What could
> be the cause of it?
>
> Regards
> Evangelos
> 66 Sprite Mk3 (HAN8)
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