If the parking brake is connected to the caliper then the piston is threaded and a special tool (not expensive) is required to spin the piston in to the caliper body. Tool is available at Sears or auto parts If parking brake not connected-you should be able to compress piston with a "C" clamp
As well if you are referring to the rear pads of course, you can get a pair of needle nose pliers, put 1 end in each groove, and rotate clock-wise to depress the piston, there is always a way around "special" tools, good luck to you
turn the brake piston to adjust. adjust all the way down.
Answer: Brake calipers (front or rear) normally "go bad" because the dust seal was not replaced, thus allow dirt to get onto the piston as the brake linings wear down. When you go replace the linings and DON"T clean the piston, it allows the dirt to damage the caliper bore. NORMALLY, brake calipers leak and can be overhauled with a few sealing rings, and a good bleeding of the brake system.
First the driver puts pressure in the foot brake, which then pushes a small piston, the piston then exerts pressure in the brake fluid. Then the increased pressure is transmitted through the fluid in the brake lines to a larger piston within the wheels of the car. Each piston pushes in a brake pad which the rubs against the brake disc, and the wheels motion is slowed down by the force of friction.
If on the rear you might have to turn the piston clockwise. If on the front you must force the piston in.
When they are worn down or damaged.
The only way to fix piston slap is to replace them. Some oil additives will quiet them down some, there are several brands available.
Pads are worn out, and your Mater Cylinder is possibly bad. Inspect the brake pads and replace as necessary. Inspect the rotor for damage and have it turned or replace it. If after replacing the pads/rotors, if the brake pedal slowly goes down when applying the brakes, replace the master cylinder.
A piston is pretty much the same wherever you find it. It's a cylindrical lump of metal that fits snugly inside a length a pipe, a cylinder. By creating a pressure on one side of the piston you can get it to move, to transfer force. Pistons are found in combustion engines, where the gasses from the burning fuel push the piston(s) down an power the engine. They're also found in braking systems. The brake pedal push down on one piston, creating pressure. The pressure moves through a pipe into the brake caliper, where anothe piston cause a brake pad to move and push against a moving surface. Pistons are also found in shocks, where the movement of the piston against an enclosed gas/liquid slows the movement of the vehicle down in a controlled manner.
The most common sign of a failing master cylinder is when you stop and while sitting there with your foot on the brake pedal, it slowly goes down toward the floor. Replace it immediately.
Remove Wheels Re-install 2 lug nuts to hold rotor in place Loosen both caliper hold down bolts Remove the 1 hold down bolt that will allow you to swing caliper out with out stressing brake line Remove front brake pad Use "c" clamp to retract piston into caliper body Remove inner brake pad and replace Replace outer brake pad Swing caliper into position and Re-install bolts REMEMBER TO PUMP BRAKES TO SET PADS AGAINST ROTOR PRIOR TO MOVING VEHICLE
Yes, you need to remove the caliper first, then use the old brake pad and a C clamp to push down the piston of the caliper.
when the piston moves down all of the water that is in the piston moves p and it comes out