Originally posted by Cool Blue Mystique:
All cars without ABS have the mechanical proportioning valve, and all cars with ABS have EBD, EDS, or whatever you want to call it. I do remember reading a recall on the thing for cars without ABS. My 6000 has Bosch ABS, and the 6000 and the Mystique have about the same braking performance I'd say. They both stop in a short distance, and they both have great ABS systems.
Not true. I have had a number of cars with ABS and mechanical proportioning valves. In addition, not all mechanical proportioning valves are alike. Some are fixed (Like my 86 pontiac 6000, born about the time you were) and some are load adjustable and connect to a rear suspension piece to compensate for loaded and unloaded conditions. My 94 Sable was like this, 4 channel ABS and a mechanical valve. Most "modern" (Modern being less than 50 years old) pickups without ABS have a variable prop. valve. Though nowadays, "rear ABS only" compensates for this. My company has a couple of Ford Econolines like this (About 2000).
