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I understand that drum brakes require residual check valves in the master cylinder and
that disc brakes don't. Is this correct? I don't know if my MC has these check valves or
not (reman'd power booster/MC into 4-wheel drums). How would I be able to tell if it
doesn't? Spongy pedal after bleeding? Long pedal travel on first press?

I know these valves are available on the aftermarket, but I don't want to install them
unless I know I don't already have 'em. Ideas?

Rich
'67 C-code 'vert (Dees67)
'69 GT FB (project car)
Check out my band: Brickyard Blues
 

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Sooo, 20 years later, no, if you have the correct master cylinder on an all drum application.
 

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Very easy. Straight a paper clip out, insert into each port in master. If you feel resistance inserting the clip, there is a residual in there. NO resistance, no residual.
 

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I have this setup - do you know if the corvette style MC have built ins?

Do you mean the ports wherE the fluid sits, insert down into the hole?
The residual valves sit underneath the flare seats in the outlet port(s). Like Dan says, a paper clip or toothpick LIGHTLY inserted will hit the rubber valve.. don't go poking it! You can remove them by using a self-tapping screw LIGHTLY screwed into the flare seat then pull the seat out with pliers and the valve will be right behind it. Pull it, replace the seat and voila.
 
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