I have no idea how to tell just by looking at one. The difference is internal. If it is the original to your truck it will be a disc/drum proportioning valve. You can try using that and then installing an adjustable valve in the rear line and see if you can dial in the braking bias that way. Some guys prefer to do it that way.
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Originally Posted by mister.freeze
how can I tell which proportioning valve I have? (The more I think about it, pretty sure I just changed the booster & kept the master cylinder.)
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