Is this a front or rear brake caliper? if a front open the bleeder and see if you able to push the piston back in the caliper, if you can then replace the rubber brake hose that goes from the body to the caliper. if with the bleeder open you are still unable to push the piston back in the caliper then replace the caliper.
if this is a rear caliper try turning the piston, some rear calipers with the emgery brake built into the caliper ( there will be a cable aitched to the rear of the caliper ) have to be reset by rotating the piston back into the caliper. DO NOT try to push the piston back in the caliper on these models or you will brake the piston. also the same rules apply to to the rear about the how to test for a bad brake hose.
Try to get it overhauled..because might be it has gone jammed due to dust clottings......else get it replaced due to severe risks of brakes jams
SOURCE: hi , On my 2005 saab 93 rear brakes . Iam trying
Hi Joe, loosen the cap on the resevoir and very slowly turn the piston, you'll feel it going back in. (They are threaded)
*Just take your time, do not rush*
Have fun :o)
To install:
Do not press the piston into the bore as performed on the front disc brakes. Due to the parking brake mechanism, the caliper piston must be turned into the bore.
WARNING
Do not press the piston into the bore as performed on the front disc brakes. Due to the parking brake mechanism, the caliper piston must be turned into the bore.
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