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Old 07-06-2023, 02:22 AM   #3
71CHEVYSHORTBED402
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Join Date: Feb 2009
Location: Northern Nevada
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Re: Does this new master cylinder look correct?

Quote:
Originally Posted by Sheepdip View Post
I don't believe the one you pulled off is the original, your new replacement would be more like the original. Those double big potted reservoir M/C's back then were referred to as a Corvette M/C because of the front and rear disc brakes.

The larger pot is for the front disc and the smaller for the rear drums. Disc brakes as they wear move outward and keep fluid in the caliper piston bores, rear drums have automatic adjusters and return springs so piston movement is minimal and less fluid required.

My hunch on the bolt is it holds the plunger in....just a SWAG.

Really good info.

To add, if it's your first MC job, bench bleed it and be sure the push rod is positioned right. You probably know to bleed the brakes no doubt.
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Tony

71 Custom Deluxe, SWB, 2WD, 402, A/C.

I developed an assembly guide (kit) for restoring this truck from the ground up, complete with details including full hardware descriptions. Much of the info. applies to all 67-72 GM. My build thread, with some info. about the assembly kit https://67-72chevytrucks.com/vboard/...d.php?t=730025
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