Ed,
The combo one is called a combination valve believe it or not :) They
sell for about $60.00 and can be purchased from any of the resto.
companies or directly from GM. But like Tom said, it is very rare for
the prop. valve or the dist. block to go bad.
Ok...Now I have replaced the master cylinder and both front flexible brake lines as well as both front calipers. Still no pedal and no decent flow of brake fluid.Now the problem must be in either the proportioning valve or the distribution block. So I know that the lines to the prop valve up front are a problem as one wrang off and the other wanted to but I turned the valve instead. Then I go under the car to the "block" and I have similar problems on the front brake lines coming in. I would love to get the brakes at least working so I can move ther car to a lift..not happening This is now becoming a pain in the ass. I have owned numerous Chevys for the past 25 years and I have never had an obstructed brake line...
