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You are talking about the piston being pushed out? #1. Put a piece of wood in the caliper and push the brake pedal again.. remove the piston all the way. clean the caliper bore, replace the seal(caliper rebuild kit usually really cheap) carefully reinstall the piston.. sounds like it is either "cocked and stuck or the caliper has a ring of rust at the top of the bore. either way clean and reinstall the piston. possibilty #2. Take a "C" Clamp and force the piston back in.. if you do this take an old pad and put it between the piston and clamp to protect the poston.
the pistons on the rear brake calipers on many modern cars screw in and out unlike the front caliper pistons that just slide in and out.This is due to the handbrake using the rear calipers for handbrake operation. A special tool is normally required that screws the pistons back in so that you can fit the new pads. On many cars one side will be a left hand thread and the other a right hand thread. Some cars will be the same thread. These rear pistons will not just push in. Good luck.
youll have to clamp the brake hose,undo the bleed screw,and push the piston[s] back in,then shut off bleed screw,undo clamp on hose,and try assembly again.bracket first,then pads into bracket,then slide caliper over pads,and then put bolts holding caliper back in ,with a bit of grease on the slides.
First Remove tire then remove caliper, most calipers are held on using two bolts. Once caliper is removed the pads generally need to be pried out using a flat head screwdriver. Be careful not to damage the seal around the piston. Once pads are removed you will need to force the pistons back into the caliper. Yo ucan do this by using a C clamp and a pc of steel flatstock. Put the flatstock over the piston and clamp to the flat stock and rear of the caliper. Turn the clamp slowly until piston is fully disengaged. You can now put the new pads in and slide the caliper assembly over the rotor. Bolt the caliper to the axle housing and install tire. This is general information only not directly related to mercedes however most vehicles are fairly similar. First take the tire off and inspect wha tyou need to do and get a good idea if what I have told you relates to your mercedes. Good luck
Compressing Rear CalipersIf you open the "bleeder valve" you'll need to bleed the air from your break system. As your breaks wear down, the level in yor break resivor will drop. what works for me is the following: Remove the cap on your resivor and place some shop raggs around the base. With a large "C" clamp push the piston back/into the break caliper (slowly) when the piston is all the in your resivor level will come up. When you complete both sides, you resivor should be near the corect level. Remember that when you put it all back together, your break pedal will go to the floor. Do this a few of times and your break pedal will tighen up. Now you should check the level in the resivor.
jack up truck support it remove tire you should see the caliper,on the back side you will see two small bolts lossen the bolts remove it might require some prying support the caliper,check the rotor if has grooves in it it should be turned. use a c clamp to force the piston back in the caliper be careful of the rubber seal put the new pads on reinstall the caliper tighten the bolts start the truck pump the brakes a few times go back check for leaks if none put tire back on remove support lower to ground test drive
My hyundai had the emergency brake bracket (mounted to the back of the caliper) rust solid. I used rust eater to get it to slightly break loose. I eventually had to replace both calipers. It is a very consistant problem. My new ones need alot of attention now as well I covered them in caliper paint to help with the rusting. The pads are very simple replacement 2 bolts on the back of the caliper. Remove the pads then screw back in the piston with a import tool from any auto parts store put pads back in, put back on the caliper.