the pistons on the rear brake calipers SCREW in to the caliper. there are notches on the inner edge of the piston face. engage the notches with a large needle nose plier or a large flat washer and turn clockwise (as you face the piston) to turn the piston in.
There is a special tool that is available at your local autoparts store that is absolutely necessary and will save you a ton of time and aggravation. Using a needle nose plier or washer does not allow you to apply enough pressure unless your are the incredible hulk. There is a great picture on europeancarweb.com/tech/0201es_big_brake_installation/index.html
How do you compress the rear brake caliper pistons to install new pads on vw polo 08 model?Read more: How_do_you_compress_the_rear_brake_caliper_pistons_to_install_new_pads_on_vw_polo_08_model
I just did mine. Use a screw driver to press the brake pads away from the rotor and compress the caliper pistons back some so you can remove the caliper off of hte rotor. Losen and remove the bolts to the brake caliper. DO NOT DISCONNECT the brake line from the caliper! Get you a c-clamp and a piece of 1/4 board about 4 inches long. Once you have removed the caliper from the mount and removed the brake pads support the caliper with one hand. Place the wood over the caliper pistons and using the c-clamp place it over the wood and center of both pistons and other side of caliper to compress the pistons back into the caliper. Make sure you DO NOT PINCH the rubber boots on the pistons. Once you have compressed the pistons back into the calipers install your new pads and calipers back on the mounting surface and tighten the bolts back to torque specs.
Unlike the front calipers, pistons in the rear usually have to be rotated to compress them.
# Preparation For Brake Pad Replacement # Remove the Wheel # Unbolt the Caliper # Remove the Old Brake Pads # Compress the Brake Piston # Re-Install the Brake Caliper
rear brake pistons are called actuated pistons. And the twist in and out. You will need a special tool to twist them back into the caliper. Unlike the Front Pistons which can be pushed back.
Jack up and block the car remove wheel pry back the caliper pistons with out breaking the pistons then remove caliper and pads.Reverse to install and pump brake pedal until it gets hard.
You need a tool mostly used on ford cars that turns the piston while pressing it.
They are twist in pistons. They do not press in like some that you can use a C-clamp on. There is a special tool I think called a spanner wrench or something like that. If you call an autoparts store they should be able to help you more.
Remove wheels Re-Install 2 lug nuts to hold rotor in place Remove caliper mounting bolts Slide caliper off rotor Compress piston into caliper body using a "C" clamp (front only) Rear pistons are threaded and require a special tool available at Sears or auto parts (not expensive) to compress piston in to caliper body Replace pads inner and outer Re-Install caliper REMEMBER TO PUMP BRAKE PEDAL TO SET PADS AGAINST ROTOR PRIOR TO MOVING VEHICLE
No need to rotate the front caliper pistons as you compress the front calipers. That process is only for the rear calipers because of the parking brake mechanism.
When installing new pads, push piston into cylinder body by gently turning piston clockwise,with long nose pliers, or suitable tool
If you do not know how to properly replace brake pads then you should send your truck to a mechanic. Working on your car without proper knowledge could hurt you and the car.