My 89 Camaro RS needs a replacement Proportioning valve, but I am unable to find one and the manual doesn't even list it, but it does list a combination valve that I can't find anywhere either. Can anyone help? This one is metric, I believe it has a 1.5 thread pitch.

can you not get one in a salvage yard??

The salvage yard claim there were 3 different one for this year model, and they wouldn't know which one mine was. I don't want to pull it off unless I know I will find a replacement, all thats wrong with it is the brake sensor switch.

cant you replace just the switch??

v6 cars v8 cars and iroc are the only three different ones!!