Quote:
Originally Posted by daveinluray
"my truck is missing its combination valve(service manuals words not mine) and I have purchased one online new. Problem is it has an extra port (two) for the front. Can I plug one or should I get a different combination/metering valve?"
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The OE style combination valves have 2 front outlets that are typically plumbed directly to the left & right front calipers. But the front brake line plumbing in 71 & 72 trucks includes an inline Tee fitting so only one front outlet is needed. You can safely plug the other unused front outlet with an inverted flare plug. In fact, I believe the factory installation used a plug (rather than a special single-outlet combo valve) for the 71 & 72 trucks.