Many thanks to all those who volunteered their helpful ideas and information about the master brake cylinder. The repair has been performed with a remanufactured unit purchased at a local auto supply for $95.50. It is an A-1 Cardone unit, part #11-2329 and corresponded to a 1982 Saab 900, as many of you said. Interestingly enough many of the bigger auto parts places around here either said they couldn't get it or quoted me an outrageous price and required a special order with a non refundable restocking fee if it was not the right one. My local shop had it in, in 2 hours and went over it all with me to confirm it was right. They even swapped over the reservoir. (Not that, that was such a big job but it was nice to get the help locally.) The repair went quite smooth and access was very good. Not one curse word was uttered! The most tedious part was cleaning the reservoir and electrical connectors with a Q Tip. Of course as luck would have it while checking on the repair, I found out that one of my fan motors is not working. It turns freely and has voltage at its connector. Are there any known failure modes or repair tricks you could share with me? Thank you all again. Dave 6530 [Non-text portions of this message have been removed]