Buy a rear brake cylinder re-winder $60. However, you can also struggle with a C-clamp and needle nose pliers, pressure - turn, pressure-turn, pressure - turn. The rear pistons rotate as brake pressure is applied which allow them to lock with the parking brake.
To compress the pistons on a Volvo rear disc brake, first, remove the wheel and access the brake caliper. Use a specialized brake caliper tool or a C-clamp to gently push the piston back into the caliper housing. If the caliper has an integrated parking brake, you may need to rotate the piston while pushing it in, so ensure to follow the specific procedure for your Volvo model. Once compressed, you can reinstall the caliper and wheel.
You will need a caliper rewinding tool
It requires a special tool to turn and compress the piston in at the same time.
To compress the rear brake caliper piston on a 2003 Acura MDX, you need to first ensure the brake fluid reservoir is capped to prevent overflow. Use a caliper tool or a C-clamp to gently push the piston back into the caliper housing. Make sure to apply even pressure and check that the brake pads are properly aligned as you compress the piston. Once fully compressed, you can reassemble the caliper and install it back onto the vehicle.
with a large pear of channel locks,or a caliper compressor
Most likely the piston will need to be turned not compressed
Rewind it with a piston rewind tool or, at a pinch, use needle nose pliers.
It requires a special tool to twist the piston back into the caliper.
the caliper piston turns clockwise to compress,the gm w-bodys are known for bad rear calipers. gmjim
If it is the front brake use a "C" clamp to retract piston If it is the rear and the parking brake is used by this caliper piston is threaded and a special tool (not expensive) available at Sears or auto parts to "screw" piston into caliper body
The piston in the rear caliper on the 2008 Grand Caravan is the "screw in" type. A special tool is required to do the job.
Shade tree mechanics use a C-clamp and a flat steel bar to compress the piston. I have also used a large adjustable Channel-Lok-type pliers to compress.