Re: '85 passenger front brake - Saab 900 Bulletin Board - Saabnet.com
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The cable can become stuck within the cable housing. Another way in which the parking brake can become stuck: the internal mechanism which rotates on ball bearings can become gummed up by rust and old dried out grease. The rebuild of these caliper is detailed in the Saab Repair manual. It is not covered by the Bentley (correctly noted above). The rebuild is somewhat complicated by the fact that one must keep the brake fluid separated from the internal "wedge" and ball bearings. The rebuild kit I received from Eeuroparts only had 1/2 the seals necessary to complete the job. In my case, the ball bearings (completely missing from the Eeuroparts kit) had rusted and become so pitted that the rotation of the lever was retarded on the return movement which is only powered by the spring. Generally, one can reach up from behind the front wheel, grasp the parking brake actuating lever and pull it open thus un-sticking the brakes. However, just as soon as you reset the parking brake you are, once again, "stuck". This is because there is an internal wedge which rotates around the cylinder (aided by the ball bearings) that pushes out the brake piston thus locking the pads up tight against the rotor. So rather than hydraulic action acting on the piston it's a mechanical action based on "pulling" the wedge into place. I can scan the Saab manual and E-mail that to you this weekend...just PM me. As it has been about six years since I completed this rebuild procedure, I will review the manual and edit as needed. I found this style of brake to work very well with the "emergency" part to be a very useful and real thing.I sourced the ball bearings from a bicycle shop.
->Posting last edited on Fri, 31 May 2019 08:02:02.
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