Proportioning valve

Mattax said

A factory disk equiped car built after Jan 1 would have come with the combo valve

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My reasoning was the 71 would have had a combo valve or a distro block but both would have the brake warning switch in it. If the OP has a post 70 combo valve I assume ( and we know what that means) if he had a drum / drum distro /brake warning block that the combo valve would be a bolt in.

Again it was an assumption that the factory would have used the same hard lines for either disk or drum to save money and the combo valve / distro block would have the same mounting and inlet / outlet locations would be the same.

I could be 100% wrong and they made them unique to prevent a distro block being put into a disk brake car.


I'm so confused!