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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.

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Q: How compress rear brake calipers of 1990 SAAB 900?
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