I did not add a type designation to this inquiry because it crosses all
Triumph cars with front disc brakes.
I am in the process of rebuilding the front calipers for my Mk I Spitfire.
Everything is apart (and, NO, I did not unbolt the two caliper halves -
they are still together) and has been cleaned, etc. There was some rust on
the pistons, which cleaned off completely with brake fluid and a good hard
rubbing with a rag.
My problem is with the cylinders that the pistons fit into. There is some
rust on the cylinder walls (not much, but it is noticeable and I can feel it
with a fingernail), and there is a bit more rust on the area of the cylinder
that is just outside of the rubber dust seal gasket. I have tried to clean
this off as best as possible using only brake fluid per the Bentley, Haynes
and Autopress manuals, but it some of it remains. The other problem is that
I tried to fit the pistons back into the cylinders but no luck. They simply
will not go back in. Any help would be appreciated as to (1) what to do
about the rust and (2) how to force the pistons back into their respective
cylinders. Thanks to all in advance.
Ross D. Vincenti
64 Spitfire 4 (undergoing surgery)
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