If buying a used replacement, it's worth noting the hydraulic side has a limited time it can be sitting removed from a car, with no hydraulic fluid in it. After a month or so isolated from the hydraulic circuit, a very fine layer of corrosion forms in the solenoid valve bores, causing them to stick. In bad weather, they could deteriorate even faster.
I would advise you buy used from a seller who either still has the unit fitted to a car, and remove it yourself. Or a trusted seller who can assure you it has just been removed. This does not apply to cars that have been sitting around for a year, with the calipers missing, and all the fluid drained.
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