Master cylinder for 1974 R-50 Chassis
HELP...HELP...HELP... I know this is about a Class A Chassis but perhaps someone has some experience. I have what appears to be a cast iron master cylinder that is leaking. It also appears to have va...
Forum Discussion
Just What IS an R-50?
I think you needs a parts person with understanding and experience. Not one who chose parts over high school. He's retired, but we had a parts man who could take the "sharp" edge of a file where the bottom meets the edge) and scratch a casting till he could read the casting numbers. Then research in ON PAPER to back into what it was and what he might do. Now the first question is "What's it On?" Either many parts outlets don't have good cross-reference data ("computer tells me this Fram number will replace your Purolator number") OR they don't know how to access and use it. A part peculiar to simply one application does in fact happen, but as often or not the part was used on something else. I needed a boat trailer brake actuator and the man I mentioned was able to supply it as from a common automotive application.
Can you substitute an available part for yours? You may be able to find a car/light truck/medium truck setup that will work if you adapt the mounting and the lines. If you do this, there's more than the obvious "getting it to bolt up." A couple are
1. when your brake pedal is released, the master cylinder piston MUST be all the way released also
2. the pin that pushes the master cylinder piston must REACH the machined pocket in the piston
3. you can't make your own brake lines using anything but steel INVERTED FLARE lines and related fittings. it's a different flare and material than hardware store stuff
I think you needs a parts person with understanding and experience. Not one who chose parts over high school. He's retired, but we had a parts man who could take the "sharp" edge of a file where the bottom meets the edge) and scratch a casting till he could read the casting numbers. Then research in ON PAPER to back into what it was and what he might do. Now the first question is "What's it On?" Either many parts outlets don't have good cross-reference data ("computer tells me this Fram number will replace your Purolator number") OR they don't know how to access and use it. A part peculiar to simply one application does in fact happen, but as often or not the part was used on something else. I needed a boat trailer brake actuator and the man I mentioned was able to supply it as from a common automotive application.
Can you substitute an available part for yours? You may be able to find a car/light truck/medium truck setup that will work if you adapt the mounting and the lines. If you do this, there's more than the obvious "getting it to bolt up." A couple are
1. when your brake pedal is released, the master cylinder piston MUST be all the way released also
2. the pin that pushes the master cylinder piston must REACH the machined pocket in the piston
3. you can't make your own brake lines using anything but steel INVERTED FLARE lines and related fittings. it's a different flare and material than hardware store stuff
