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Now I'm a little confused again with the statement that the rod "does not touch the master cylinder walls and push fluid ahead of it" While it's true that the rod itself doesn't do this, the piston at the end of the rod, which includes a valve, does apply pressure to the fluid in the master cylinder, correct?
The BTV's hydraulic plunger doesn't work like a piston in an engine, let alone a conventional master cylinder, but applies displacement through a different perspective. For example, if you take a bucket and fill it with water right up to the rim, and then make a fist and slowly plunge your arm into the bucket, that water spills over the top. Same thing applies in the BTV. With compensator valve closed (and no other leaks), the entry of the plunger into the confined space displaces the brake fluid (albeit under much greater pressure) out into the lines to push the pistons in the wheel cylinders.
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Unfortunately, I printed out the pages of the '55 manual that Brian mentioned and couldn't read the darn part labels on the illustrations.
The PDF files at
PackardInfo were not scanned to replace printed manuals, but only to provide a quick on-screen reference. High print quality would require much higher scan resolution, which - in turn - means even larger file size. When you open the PDF file in Adobe Reader, you can zoom in on the image. At 200-300%, it's a bit more readable, but if you click on the image provided in Howard's post, above, you may find the results (in a new window) more to your liking.
Yet, keep in mind that there are some differences WRT to details of the vacuum section between your unit and the 55-56 version. A detailed cross-section of your unit is provided in the illustration of the
48-54 parts book - see Plate No. 43 in the
Part Diagram Plates section, but with components labelled by group numbers. Refer to the
Group 1 - Brake section to decode those.
For a little background on Packard's offering of the BTV (referred to as Easamatic Power Brakes), look to the site's live
51-54 Service Index, under the
Brakes section.
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