Thread: Proportioning Valve? Dual inlet/outlet vs Single inlet/outlet

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Pat, Thx for the info. I am not sure what I was actually looking at. The item I initially saw was a GM proportioning valve that had 2 ins and 2 outs with a safety light switch. Now that I know more about what these things are, Ill go back and do some more snooping.
Thx again -Joe

My 68 suburban has a block with one-in and one-out on each end (total four fittings) appears to be blocked in the middle where an electrical sender is. There doesn't seem to be anything else inside. Is this the right piece for front disc?

AzDon,
Is it a stock setup, or did you switch it to front disc's?

The factory 1968 drum/drum master will have the residual check valves built into the master, and have a failure block (sounds like what you see) When you get a leak it will move to the low pressure side trip a switch which will turn on the light on the dash.
You should add a porportioning valve to the rear brakes, if this is a none factory setup, because a drum/drum setup did not come with one!

A combination valve is both in one, plus has metering valve to the front wheels.

Picture is of what you have now, and if it is a factory disc setup, there should be another block in the rear line after this block, to the rear brakes which would be the proportioning valve.

The other picture is of a combination valve with 5 lines.

Pat