Hy HFfarms, yes there are parts books they usually cover a range of years and are usually split into light trucks, medium duty trucks and heavy duty trucks. They can be a mystery until you learn how to read them. They are not necessarily consistent, for example sometimes there will be a reference to the original manufacturers part numbers,casting numbers, or stamped numbers and sometimes no reference at all. If you can locate a parts book which covers your year and size of truck, I would buy it. You can learn to read it as you work on your truck, good luck.
I will keep my eyes out for this specifically then, appreciate the input.
If it is determined that the second line is what's making the mess, plumb that line into a larger tank/resevour that sits next to the MC and let it gravity feed back into the MC. The big tank can have lots of extra air space to handle the surge.
Mike B
Not sure how, but Napa located a fresh 12.75" hydro-vac for about $130 and it is on its way now. As to the slosh, it appears to be due to the lack of cap seal, and a new MC should solve it. Currently tracing a modern part number for this MC.
For anyone reading this thread in the future, closer inspection of the MC yielded part number 5462223 as a Delco Moraine 1 1/4" bore. So not only is the master a two line unit, it is a larger single bore than standard. So in conclusion, these trucks had an optional factory upgrade to a 12 3/4" Bendix Multi-vac which must then correspond to a unique master cylinder with larger bore and second return line inlet. To tell if a truck has this package, inspect for a second 5/16" line dropping out of the master reservoir and running to the hydro-vac. I do not know the RPO for this option right now. I will try and dig it up however.
Additionally, part number UP2474 is the maxi-pack that is needed for the 5k lb front axle brakes for this truck (60-65 C60). Part number is listed for the C50 lines but interchanges with the C60. We inspected against the hardware I removed and all matched up. The only thing the pack doesn't have is the lower shoe retaining spring that sits above the manual adjuster. I should have the fronts together this evening and will disassemble the rears and report back on sizing to begin the hunt for rear brake parts.
