Replacement Chevrolet master cylinder

[Hanno Spoelstra]

I am trying to piece together some useable info for replacement Chevrolet master cylinders, as the original 1-1/4" bore bottom mount cylinders are hard to get.

Ten years ago Barry posted he used an off the shelf Wagner unit with side mounts. He fabricated a bracket to fit it to a C8A. Barry, would you by any chance remember the Wagner part no.?

Thanks,
Hanno

Originally Posted by Barry Churcher

We are in the process of making up a bracket to replace the master cylinder with the same 1.25 bore and the side mounts.
This cylinder is still available from Wagner.
Master Cylinder.jpg

[Grant Bowker]

Hopefully Barry will be able to remember the exact part number he used.
If he can't remember- my guess, based only on the 1-1/4" bore diameter and general shape, is that it might be a Wagner (or Raybestos) MC-4355. This is not certain but may help others in researching the answer. A posting on the G503 forum http://forums.g503.com/viewtopic.php?t=222244 claims the 4355 master is correct for the G506 Chevrolet as well as 3/4 and 1 ton pickups of the period - apparently not CMP correct but period Chevrolet.

[Hanno Spoelstra]

Thanks Grant, that could be it.

Let’s see if Barry has recorded the part number somewhere. There’s also a thread by Barry mentioning his shop fitting a dual circuit master cylinder to a C8.

Cheers,
Hanno

[rob love]

I have successfully installed the Ford master cylinder into that location by making up a new bracket. The Ford master cylinders are relatively cheap over here....at one point I think I was paying $35USD for them.

After all, adding anything Ford can only make a chev better.

[Bruce Parker (RIP)]

Wagner MC F9220 is the part number for a master cylinder identical to the WW2 Chev type except it has the two horizontal mounting holes cast into the body instead of the flat base with the two studs as per the WW2 type. I hope to sleeve a WW2 original for my HUW but failing that this one goes in. It will require an angle bracket with four holes to adapt the original stud mount to these two horizontal bolts.

I did a quick google search and this number didn't come up so it may be as hard to find as the original however.

[Grant Bowker]

Most Wagner master cylinders seem to have a 2 letter prefix, commonly FD or FE. Raybestos markets a replacement for the 9220 as MC9220, Dorman sells as M9220, NAPA as NMC P9220.