Let me ask this....can anyone tell me when and if Ford used a Master cylinder after 1952 with the 1.5 bore size ( or above ) preferably that will bolt onto my 1986 F-250 ( actually I plan to replace the 250 booster with a 350 booster since it will take up less space, is a dual diaphragm and will still from what I have found bolt directly onto my 86 pedal assy )
I need help locating a good part # for a MC bore size of 1.5

I have read for instance on-line that a 2005 F-350 used a bore size of 1.5 and a 99 F-350 carried a bore size of 1 5/8. I would bet that in this case a bit bigger would be better. I would prefer if possible to find a piston bore diam the same size or bigger that what was originally in my truck because it just makes sense that they matched the MC bore size with the wheel cylinder bore size.

Kicker is though is I do not know whether or not either of these MC will bolt onto either of my intended brake boosters. I guess it may come down to up-setting the Napa man by going thru his stock just to see what fits.

I dont know why but 2 5/8 spacing on my booster comes to mind and from what I have read Ford used this spacing as standard for many years but I do not know if that bit of info is relevant when considering the larger trucks I.E larger bore sizes. HELP!

 

That sounds like a NumberDummy question. Bumping this back to the top so maybe someone smarter than I will respond. You might try a PM to him to direct him to this thread.

 

Have you considered strolling through a junk yard for recon purposes?

 

Thats for sure, I plan to call him when it gets a little later

 

Definitely, one of my favorite pastimes, lot of time and work removing masters to get that measurement though and I am pretty sure at this point that I am going to be out of luck with finding anything larger than the 1 1/4 bore master that I picked up at Napa this A.M. that will fit my power booster/pedal assy.

 

I think ND Bill is on a Cruise Ship heading for the South Pacific as of yesterday.

 

Thanks for posting this, I called yesterday and left a message and did not hear back from him. I was gonna call again but now of course I will not. Any idea how long he will be gone, no too long I hope, we got Fords to fix

 

I think he said he be back the 20th.

 

000000Thanks