Jason,
It will be one of the following:
1. Flexible hoses. If they are more than 5 years old, replace them anyway,
preferrably with the steel braided type. These are available from the usual
specialists. The old rubber ones get blocked when the interior tube starts to
disintegrate, with rubber detritus forming a blockage.
2. The pistons are sticking in the calipers, due to long use and corrosion.
This is a common fault with cars that are stored or out of use for long
periods. If so, the only solution is to dismantle, and install new seals, and
dust covers. If the pistons are corroded, you'll need a set of those also.
I'm afraid to say this is the most likely cause. A bit of a dirty job, but
any competent mechanic should be up to it. Alternatively, get hold of a
replacement pair of calipers, again from the usual suspects. It is advisable
to do the pair, or you'll soon find the other brake will have the same
problem.
Good luck.
Julian.
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