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Quote:
Originally Posted by Terry,OH
I have a master cylinder that I had thought could be 49-51 since it mounts from the side in two places. It has an elabrate mechanism to reverse brake rod motion and several of the features of the 49-51 master cylinder. The bore is marked on the side as 1. Is this 49-51? Note the large hex on the end can be removed to expose the internals.
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That's a 1955 (second series) through 1959 GM truck cylinder. Probably 1-1/8" bore, used in 1/2 and 3/4 ton Chevy and GMC trucks.
In the GM chassis, the pedal pivots in the fork on the cylinder, with no added hardware.
Joe