Can anyone tell me for sure the first year C60's & similar trucks were equiped with power steering pump assist power brakes & not hydravacs? I know 1988 had the power steering pump assist but I'm looking at a parts truck on E-Bay that the owner does not know if it has Hydravac. It's a 1986. I'd hate to spend the money, drive 150 miles & find it has Hydravac. HELP!!!