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Date: 12 Apr 2006 21:22:17 -0700 From: "markcnospam.com" <markcharlesnospamv.net> Subject: Re: '89 900 (non-turbo) Rear Caliper Piston Question
When the caliper piston is as retracted back as far as it will go by using just the allen/hex screw adjuster then some gentle 'coaxing' with a C-clamp is needed to help push it back just a millimeter or so further (nothing forceful). After doing that then you again adjust the allen screw to 'take up the slack'. You may need to use the C-clamp again and don't forget to follow it up by using the allen wrench. This advice was told to me by a Saab mechanic and it worked out good for me. Just remember never to force it and be patient. I once again advise to not do this cailper rebuild if you get easily frustrated because Murphey's Law will definitely be a reality. Luckily I had a parts car ('87 9000) which I used a rear caliper from because on one of the 900 calipers I could not get the adjuster plug/screw (to access the piston adjuster) loose because it was so rusted that it had become fused to the caliper body. Unlike the other rear caliper this particluar 'adjuster access screw' was also an allen type so it was very difficult to try to remove it because the allen wrench (when compared to a socket or wrench) is so thin that it just bent under the stress of trying to torque it loose.
