Jim SNIP HI......... Where is the proportioning valve located on a 79 Concord???????? Thanks, Jim SNIP The proportioning valve, also known and functions as the pressure differential valve is located on the passenger side bottom of the fire wall where the chassis rail comes into the fire wall under the hood. (Or very close to that location) and may be solid brass or plumbed up from what looks like pipe. I would not be a bad idea to get the lines and fittings too as I think that there is an odd fitting used there that you may want to re-use. John. _______________________________________________ AMC-List mailing list AMC-List@xxxxxxxxxxxx http://www.amc-list.com/mailman/listinfo/amc-list or go to http://www.amc-list.com