Brakes
This is a repost from a prior question. I think it applies to your problem also.
I would bleed the system with a low pressure bleeder. That would keep any air in the system from being compressed and getting lodged somewhere. You can build one if you have a compressor, a pressure regulator, some flat 1/4 inch thick rubber material, some flat 1/4 inch steel and a quick connect fitting and a large "C" clamp. Cut the steel to a size that would cover the top of the master cylinder. Then cut a piece of flat rubber to the same dimensions. Glue the rubber to the steel plate. After it has cured, drill and tap a hole to accomodate the fitting. Install the fitting using teflon tape. Remove the master cylinder cover and fill the reservoir. Place the plate over the master cylinder, and clamp it it place with the clamp. Connect the regulator to the compressor and connect the regulator to the fitting on the master cylinder. Bring the pressure up to where the gauge on the low side of the reg just barely moves. Then bleed the system. Start with the wheel furthest from the master cylinder. After bleeding each wheel, remove the plate and refill the master cylinder. You don't want to introduce any air into the system. Be sure to crank the pressure down before removing the plate from the master cylinder. This will remove any air from your system and you will have a bleeder for future use. I got the design from a car magazine (don't remember which one) and it works great.