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Working on a 1972 270 Chassis. My master cylinder is sending very little pressure to the front brakes. After some research it appears a common mistake when changing master cylinder is using the IH version which shares the same casting as our Dodge however the internals are different. I was told I can identify the INCORRECT MC as having the same sized brake line ports. Dodge units had different sized ports. Mine has been replaced with the incorrect unit.\n\nI called Alretta and was told that he supplies the correct master cylinder with the correct proportioning for the dodge motorhome however I have to reuse my Master Cylinders piston rod and retaining snap ring and washer. \n\nI am in trouble because I no longer have my MC to source the parts from.\n\nDoes anyone have a source for an old Master Cylinder?\n\nKarl

This page may help. Which chassis does your 270 have?\nhttp://dave78chieftain.com/MasterCylinder.htm

I have the m375. \n\nIt is my understanding that the master cylinders commonly listed for the m375 are for the IH application.

For 72 you should have a M375 chassis. Try this page 1972-73 Dodge Class A M375 (Late) Motorhome Brakes

I had planned on purchasing one of those units until I read on another forum that Alretta states that those are likely the International Harvester units that share the casting but internally are not correct for the Dodge chassis.\n\nHas anyone successfully used one of the units from Napa or Centric?