Maybe the rubber seal is loose on the piston, somehow. Round metal brake
MCs became the usual replacement for the square metal ones which went AWOL a
few years ago, I paid quite a bit more for one of the last square ones. Not
heard of the EU ban on metal brake MCs before. Whilst North America changed
to plastic masters in 67, the UK didn't until 77.
PaulH.
----- Original Message -----
> Fitted a replacement brake master cylinder yesterday. It doesn't look
quite
> the same (round plastic reservoir rather than square tin reservoir, bit
less
> capacity for fluid), but the MGB Hive said it was still fine, new EU
> regulations prevent the sale of metal reservoirs.
>
> The old cylinder exhibits strange behaviour. The piston flops around and
> moves in and out by an inch or two like it's not connected to anything at
> all inside.
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