Very simple buddy, You CAN NOT use the regular method of just pushing the piston back in the caliper. DO NOT TRY you will break your tool!. You must apply the caliper spreader but do not over do the pressure you apply. then take a 14mm wrench or socket and remove the bolt in the back. There is something inside that takes an Allen key to turn. find one that fits and loosen that while tightening the brake spreader, and there you go it should move back into the caliper and if it does not then your caliper needs to be replaced because it is froze.
Take off the brake calipers, but let the brake line be mounted. Attach the caliper to a string so that it does not hang by the brake hose. Take out the old brake pads. Compress the pistons together. You may need a special Saab tool for this. Apply some copper paste or similar grease to the sides of the caliper and mount the new brake pads. Check that everything runs smoothly before mounting everything back together.
There are several different front brake calipers for the Saab 900 depending on the year. The first is from 1979-1987 and is the same as that on the Saab 99 beginning in 1975. You need a special tool to rotate the caliper piston back into place because the front caliper also acts as the parking brake. From 1988 thru 1993, the front calipers on the Classic 900 are the same as those on the Saab 9000. The NG 900 has a completely different brake caliper setup beginning with the 1994 model.
Like all cars, Saab 900s have brakes. The calipers are part of the braking system. The braking system was basically the same on all Saab 99s and 900s from 1975 to 1987. What's the question?
in the rear on the left side
The current owners of Saab are Spyker Cars.
1988 thru 1993 Saab 900 is the same as the Saab 9000 as they use the same brakes. 4-bolt, 108mm circle. They use lug bolts instead of lug nuts to secure the wheel to the hub.
remove glove box and remove fuse box screws
Front of the engine right behind the radiator.
T-55
The clutch master cylinder is supplied from the brake fluid reservoir via a rubber tube.
remove spring clip of the front 7mm Allen key socket for sliders BUT a special tool is required a rear brake piston wind back tool with saab/vauxhall attachment a easy job with the right tool clockwise rotation
Beginning with MY 1988, the 900s had the same brakes as the 9000s. The rear brake piston must be turned in with a special wrench, not compressed as in earlier 900s.According to the manual (you do have a manual, don't you!) you need to remove the threaded screw plug covering the adjusting screw. The piston adjusting screw requires a 4mm Allen head wrench.