MGA master cylinder rebuild

["Howard Battan" <battanhr@comcast.net>]

I'm still fighting my MGA master brake/clutch cylinder rebuild. I cleaned up
the MC and honed out the cylinder bore to clean them up well. Then I put in
a new rebuild kit. The problem is that when I push the pistons into the
bores, they do not return. I need to use air pressure to get them back out
to the unloaded position. BTW, this is on the bench, not on the car.

What am I doing wrong? Any hints?

Thanks

Howard Battan
'57 MGA
'79 MGB