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If you do it right you can watch the results of application and release of the brakes fluid DOT 5 move in and out of the reservoir to the brake cylinders and back again. The top of the sightglass is the vent.

Did you jack and crib it, remove all the wheels and drums and inspect it? Perhaps one should not begin at the top of the mountain Lots of mechanisms to repair, replace, inspect Air over hydraulic, steel lines, rubber lines, springs, fasteners, hold downs, unions, couplings, transfer stays...