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It's often related to a damaged or broken dust seal on the piston, This allows water and dirt to get into the caliper bore or onto the piston causing corrosion and dirt buildup, which essentially seizes the piston. When brakes are applied, the piston presses the pad against the rotor, but won't release back into the bore.
Use a "C" clamp to collapse the caliper piston. Use one of the old pads across the face of the piston. If you use the clamp on the bottom of the piston it is possible to crack the piston. Using the old pad spreads the pressure to both sides of the piston. That is if the piston is a cup. If it is solid on the face then it screws in, but I believe this type is only used on the rear brakes of cars.
Up to about 1999, no. Only needed a large C clamp to push the piston back in the cylinger. After 2000 some rear brakes have the the screw type piston which requires you to un-screw the caliper back to the un-used pad position.
It requires a special tool to twist the piston back into the caliper.
The back brakes on my Honda Accord are disc brakes. After removing the brake cylinder assembly you will see the brake cylinder piston end has a slot in it. The short pin on the back side of the inner brake pad fits into this slot, but also it is used to 'Turn' (clock-wise) the piston back into the cylinder so you fit the assembly back over the new 'thicker' pads. You can not 'press' this piston back into the cylinder.
Some brakes require the brake caliber piston to be screwed back in rather then compressed with a C-clamp. They sell a cheap tool to help facilitate the job.
To change the front disc brakes on a Kia Rio, simply remove the assembly held by two bolts. Push the piston back and replace the disc brakes with new.
To squeeze the piston back inside the caliper, you need to twist and push in on the piston. Turn the piston clockwise with a big screwdriver if you do not have the correct tool to do so. A large prybar works good for this. Eddie
Do not use a channel lock or clamp device to push piston back or you may damage piston , insert tool in slotted holes of piston then turn to screw piston in or out . on Girling system such as 2001 Honda ex rear only. front normal
a C clamp will do it, but only if it has no electronic brakes.
You don't remove the piston, you just compress it. Loosen the cap on the master cylinder and then compress the piston all the way in. You can then remove the old pad and install a new one.
If the brakes are disk on the rear they can't be push or pressed in they have to be screwed in by turning the piston clock wise try this it should work. That is what I did on my 1994 Nissan Maxima becareful not to damage the rubber dust boot on the piston.