Re: Hydroboost on a 58 -59 3100
Metering and residual valves are the same thing that’s your 2 pound and 10 pound valves to keep pressure on the brakes when the master is on the frame.
A proportioning valve is just that it does not have a different name
Some master cylinders have the residual valves built-in. You should see it just inside the port.
Some modern proportioning valves off of GM trucks and cars have a combination valve where it’s both are proportional, and a residual all built in together
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