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You need to compress the caliper piston back into the caliper assembly to allow the new pads to fit over the rotor. A C clamp can be used to compress the caliper piston. Be sure to remove the brake reservoir cap before compressing the piston and remove excess fluid from the reservoir to prevent over filling.
A special tool is required to compress the caliper piston on the rear brakes-don't use a C-clamp on the piston. Raise the vehicle and remove the tire. The rear calipers have only one guide pin. Remove this pin and raise the caliper. Remove the old brake pads. Using the special tool compress the caliper piston-the piston will have one or two slots on it. These slots must in the correct position to remount the caliper. Install the new brake pads and slide the caliper back over the rotor and replace the guide pin. If the caliper doesn't slide over the rotor you'll need to reset the slots on the piston. Replace the tires and you're ready to go.
YOU NEED A PISTON COMPRESS TOOL TO PRESS PISTON BACK IN THE BORE WITH THE BLEEDER SCREW OPEN ON THE CALIPER*.CLOSE BLEEDER SCREW JUST BEFORE THE CALIPER PISTON IS PUSHED FULLY INTO CALIPER.THIS WILL ALLOW ROOM FOR NEW BRAKE PADS AND CALIPER FIT OVER THE BRAKE ROTOR.WHEN FINISH.PUTTING BRAKE PADS ON YOU HAVE TO BLEED BRAKE SYSTEM.DONT DRIVE VECHICLE IF YOU CANT GET A GOOD FIRM BRAKES.
Loosen the brake fluid reservoir cap to allow pressure to escape. Use a large C clamp connecting it to the front of the piston and back of the housing. Turn the screw on the clamp to compress the brake piston then release the clamp. The piston will remain compressed allowing you the fit the housing over the new brake pads.
jack up car, remove the road wheels, at the rear of the caliper you will have 2 or 3 bolts holding the caliper onto the stub axle, remove the bolts and remove the caliper, remove the outer pad, leave the inner pad in place and use a "G" clamp to compress the brake piston until it has bottomed, if this is not done the new pads will not fit back over the rotor as the piston is too far out and the new pads are thicker than the old ones.
place the new pads in the caliper and fit over the rotor, replace the 2 or 3 bolts that hold the caliper in place, replace the road wheel, tighten the nuts and lower the car to the ground, pump the brake pedal to see if you have brakes, if you do have brakes take it for a test drive away from any traffic if possible
The rear disk brake piston does not compress back into the caliper, it has notces on the caliper piston that a tool fits into and the caliper piston is actually turned or screwed back into the caliper, and a notch in the piston must also be aligned to fit the the small protrusion from the backing plate of the inner brake pad.
The brake tool can be obtained from most auto part stores, and it is usually square with protrusions sticking out from the sides in different patterns to fit various caliper pistons, and it usually attaches to a 3/8" drive extension and ratchet.
Do not compress this type of caliper piston because the caliper can damaged.
no that is only the older rear calipers on gm and others. the fronts do not have that style caliper and sound like the calipers are frozen and may be way your changing the pads. try opening the bleeder screw and then compressing them if they go then you need need brake hoses and if not you need calipers. god luck man
Special tool is a 1" cube with tabs on each side that fits into indentations on the brake piston and can be purchased for $10-12 @ most discount parts stores. Use 3/8" ratchet with short extension and 'special tool to carefully turn piston onto internal hand brake screw. Take care to not tear dust boot. When piston is fully collapsed, make sure to align piston indentations perpendicular to brake pad as there are bumps on pad that fit into them. Also while screwing in piston either remove about 2/3 of brake fluid in master cylinder and refil afterwords or open the bleeder valve on brake piston assembly. Bleed if necessary.
One, take your brake fluid reservoir cap off.
Two, use a thin piece of wood to help you compress the piston on the caliper....do it slow. This way, you don't create a lot of pressure to the reservoir and it won't overflow.
Three, these are the steps to removing and replacing the pads for the rear. It does mention a special tool....but you can use a c-clamp for the same purpose:
Check the brake fluid level in the brake master cylinder reservoir.
If required, remove the fluid until the brake master cylinder reservoir is half full.
CAUTION Care must be taken when servicing rear brake components without disconnecting the parking brake cable from the brake caliper lever.
Remove the disc brake caliper. Support the caliper with mechanic's wire.
CAUTION When the brake pads are separated from the brake caliper, new brake pads must be installed. The brake pads are one-time use only.
Remove and discard the brake pads and spring clips from the brake caliper anchor plate.
NOTE: Do not remove the anchor plate guide pins. The guide pins are press fit to the brake caliper anchor plate. If the guide pins are damaged a new anchor plate must be installed.
Inspect the brake caliper anchor plate assembly.
Check the guide pins and boots for binding or damage.
Install a new brake caliper anchor plate if it is worn or damaged.
To Install: NOTE: The left caliper piston turns clockwise and the right caliper piston turns counterclockwise.
Using the special tool, turn and compress the brake caliper piston into the cylinder.
Clean the residual adhesive from the brake caliper fingers and pistons using the specified brake parts cleaner.
CAUTION Do not allow grease, oil, brake fluid or other contaminants to contact the brake pad or caliper mating surface. Do not install contaminated pads. NOTE: Install all the new hardware supplied with brake pad kit.
Install the new spring clips and brake pads.
Position the brake caliper and install the 2 bolts. Tighten caliper bolts to 23 ft-lbs (31 Nm).
If necessary, fill the brake master cylinder reservoir with clean brake fluid.
With the engine running, apply pressure on the brake pedal to seat the brake pads.