Date: Mon, 10 Jul 2000 21:52:19 +0200 From: Robert Brown <rjbnopsamnetNOSPAM.se> Subject: Re: '89 900 Calipers
Hi, comments below: Marty wrote: > Always replace brake and suspension parts in pairs, both front or both > rears. > Maybe an extreme way of putting it. I've replaced a single front caliper due to corrosion in the brake piston, on three separate occasions, with no brake balance problems afterwards. As long as one can be sure that the caliper *not* being replaced is functioning fully and free from grit, corrosion etc. then there's an excellent chance that both calipers will give the same stopping power (i.e. not pull the car left or right under braking). Just remember to replace all four pads front (or back) as part of the job. Saab workshops in this country will happily replace a single caliper, provided the above conditions are met. I've also replaced a single lower front wishbone, many single balljoints - no problems afterwards. In some cases it may be necessary to rebuild (i.e. new seals) the caliper not being changed, but that's often cheaper than buying a new caliper. But I think you're absolutely right as regards the replacement of brake pads and disks, dampers (shocks), and tyres. Many recommend that these are replaced in left and right sets at the same time. > > Frozen calipers usually mean corrosion in the cylinder is causing the > piston to stick, which will cause excessive and uneven pad wear as well as > uneven braking. Yes - due sometimes to deteriorating seals or too much water absorbed by the brake fluid. The latter is my problem because I'm too damned lazy to change the fluid every couple of years. Which is why I've become pretty good at replacing and reconditioning brakes ;-) Regards, Robert Gothenburg 1983 900 GL 1999 9-3 200 1983 99 GL (r.i.p.) > > > Depending on how bad the problem is, it might be possible prepair but > replacing both rear calipers is a very good idea. > > Marty / SPG9 > > Fran McCormack wrote: > > > I brought my '89 900 to a "Speedy" brake shop for new pads. I was told > > that the rear calipers were "frozen" and had to be replaced. The > > technicians clearly were not familiar with this car in that they > > couldn't reset the e-brake. > > > > Can anyone tell me if there is a certain way to release these calipers > > other than replacing banging on the piston? Also, do calipers have to > > be purchased and installed in pairs? I found that only one caliper was > > "frozen" and I bought two new ones. Thanks in Advance...
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