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Potential for Loss of Power Assist in Braking System (LONG) Posted by Dave the Ice Age Knave [Email] (#2068) [Profile/Gallery] (more from Dave the Ice Age Knave) on Wed, 5 Oct 2016 17:52:44 Members do not see ads below this line. - Help Keep This Site Online - Signup |
Although this warning applies specifically to a 2006 9-5 Damn Edna automatic, other Saab 9-5 systems may be identical or similar:
Should the black one-way vacuum valve fail between the intake and brake booster (aka brake servo) unit, there will most likely be a sudden or almost immediate loss of power assist. I was fortunate that when this happened to me, I was driving at a very slow speed while turning onto a road. The loss of braking ability was shocking, something in the order of 75%. I pulled over at the earliest opportunity and found the valve had separated from the vacuum line. The valve nipple was partially broken but I was able to rejoin the line to the remaining part of the valve nipple and carefully drive the few remaining white knuckle kilometres home. It's quite possible that I had put some pressure on that area a couple of days before with my ham fist while searching for oil leaks. Had the vehicle been new, the German made valve would probably have been fine but 10 years of extreme temperatures and normal oxidation had probably taken it's toll. My recommendation to self and to anyone who chooses to listen is to replace the entire pcv system with OE parts no later than every ten years or 100,000km. After replacement, I noted that the broken valve had lost its one-way function. We do read a lot about enthusiasts replacing old PCV and vacuum lines but the equally important focus should be on the various valves. I do not recommend aftermarket parts since they may not work correctly -it's ORIO cookie cut parts with the Deutsche valves or nothing. As a further footnote, I speculate the old Dame has ceramic pads in the front as opposed to semi-metallic. A power assist failure results in an order of fear higher with ceramics rather than semi-metallic due to the need for higher brake force, IMHO, over semi-metallic to accomplish the same degree of braking.
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