as stated, hydravac 1st, BUT, you also need to loosen the upper brake shoe on each rear wheel all the way before you start, otherwise it will trap air in the wheel cylinder. Here is a link to the online manual for a 55. I am not sure which side your hydravac is on, my 55 has it on the pass side, my 58 it is on the driver side so the "farthest wheel" may be the opposite side than the manual depending on your truck. I also built a pressure bleeder that makes it a lot easier!
http://chevy.oldcarmanualproject.com/shop/1955truck2/55ctsm0507.htm


Mike
1955 Chevy 6400 ex-flatbed (no bed now!) sold September 2023
In the Stovebolt Gallery
1958 Chevy 6400 flatbed W/dump
In the Stovebolt Gallery
1959 Chevy Suburban Owned for almost 20 years, Daily Driver -- sold May 2016
In the Stovebolt Gallery

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