there is a special tool that can be purchased at any auto parts store made specifically for compressing brake caliper pistons. I personally use a 4 inch c-clamp. works every time.
If it has come out completely, lubricate the disc brake piston and the piston bore (in the caliper) with clean brake fluid. Make sure the dust boot is clean and is seated in the caliper. Using a turning motion (back & forth), roll the lip of the dust boot over the piston and push the piston into the caliper by hand as far as you can go. You'll need a c-clamp and a block of wood (or an old brake pad) so that you can push the piston all the way into the bore. Go slowly as you are pushing and keep an eye on the piston so that it goes in straight with no resistance. You don't want to damage the sides of the piston. If the piston goes to the bottom with no problem, seat the dust boot lip into the piston groove. You'll have to bleed the brakes once the pads are in and the caliper is reinstalled.
2 the right butt on some of them U have 2 compress the piston AS U are turning IT 2 the right & also the bleeder screw should b open AS not 2 compress old brake fliud backwards into the Master Cylinder.
Either the caliper piston is frozen stuck or the hydraulic brake hose has collapsed internally. Open the bleeder on that caliper and see if the pressure releases, if it does you have a bad brake hose.
open the bleeder valve I'm assuming your talking about a disk brake, you need to use a C clamp and the old brake pads to force the piston back into the caliper. If it had a X in the head of the piston you need to get the tool to turn it back in. If all that doesn't work, the caliper is frozen and it needs to be replaced
* Lift truck using your floor jack (use jack stands for safety) * Remove rim * Remove bottom bolt on caliper using 3/4 inch socket * Loosen top bolt on caliper using 3/4 inch socket * Now pull caliper and it should swing up * Remove old brake pads by pulling ( Only your fingers needed ) * Install new brake pads * Grease back side of brake pads with your choice brake grease * Compress pistons with piston comressor ( I bought mine at an auto part store for $8.00) * Pull caliper back over brake pads * Screw in bottom bolt and tighten * Tighten top bolt * Put your rim back on * Follow same instructions for other side * Drink your favorite beer
You can use a large C-Clamp to compress the caliper piston.
with a c clamp. put a block of wood or your old pad over the piston and tighten with clamp.
If the emergency brake is not connected to the caliper use a "c" Clamp If the emergency brake is connected to that caliper a special tool (not expensive available at Sears or auto parts) is needed Caliper is threaded. Turn Clockwise to compress
If the emergency brake is not connected to the caliper use a "c" Clamp If the emergency brake is connected to that caliper a special tool (not expensive available at Sears or auto parts) is needed Caliper is threaded. Turn Clockwise to compress
C or G clamps.
You will need a caliper rewinding tool
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
It requires a special tool to turn and compress the piston in at the same time.
AnswerThere is not enough information in your question. A cylinder piston you do not compress, you compress the rings in the piston. There are pistons in the brake system. There is no way of knowing the problem without being more specific.I'm assuming you mean the caliper piston. If it can't be compressed, replace the caliper.
there is a special tool that can be purchased at any auto parts store made specifically for compressing brake caliper pistons. I personally use a 4 inch c-clamp. works every time.
Use a "c" clamp to fully compress piston into caliper body
The teves caliper is a single piston disc brake caliper and the akebono caliper is a dual piston disc brake caliper. The teves caliper is a single piston disc brake caliper and the akebono caliper is a dual piston disc brake caliper.