M series wheel cylinders

[RareBird]

Fellas, I need some help. I put Ford wheel cylinders (1932-1947) on my truck.
They are similair 1 3/8" x 1 on front and 1 1/8 X 1" on rear. My problem? They are leaking inside the drum. I got new ones figuring maybe I got bad part. Even with the drums off I have a steady stream coming out of the cup.
Any thoughts?

[wolfie]

Are the new ones leaking also? Both sides? Steve

[RareBird]

yes, My next move is to adjust the shoes out and see if they aren't adjusted in too much. Problem there is drums won't turn freely

[nvonada]

Could be a badly worn drum too. What kind of brake fluid are you running?

[RareBird]

I've pulled drum off and had wife pump the brake - still have fluid streaming out. Could it be that the cylinders are defective? I had sure cups were in correctly ( and that they were there) Ileaning towards bad parts. Any thoughts??

[RareBird]

I think I've figured it out. Ford wheel cylinders have a 7/16" shaft that sticks out of center of piston where the shoe rest. This is pushing my shoes in too far in tne cylinder allowing fluid to leak past the cup. My son is taking the pistons of a cylinder to work and removing the center shaft. I'll keep you posted. By the way Ford cylinders were only $41.00 each compared to $120.00 to have Stude cylinders resleeved.

[StudeRich]

If it is an M5, new Front cylinders would have cost you the same as re-sleeved, and no shipping cores, paying for 2 shipments and waiting for rework.