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you will need to find out if this is due to stuck pads on the bracket or a brake hose or bad caliper, the first step is to open the bleeder screw on the caliper and see if the brakes release if they due then its a hose if they dont then move to checking caliper, remove the caliper and see if the pads slide on and off the bracket with ease if not then clean braket so pads slide on by hand and also use a c clamp and push piston back in, this should be easy if its real hard to turn the c clamp then caliper is bad, and last is the caliper slides, this is the slides that the caliper moves on, the bolts bolt to it, make sure they slide in and out with ease.
You need to use a (C) clamp to depress the caliper into its bore, only after opening the bleeder valve to exit the filthy fluid. Only then can you remove the caliper. You need to free the pressure against the rotor. Not being sarcastic here but if you know how to properly replace brake pads you should have known this.
The new pads are much thicker than your old ones, so you need to get a large C-clamp, like a 5" clamp, open it up, put it over the caliper with the top of the clamp on the back of the caliper and with the screw adjustment of the clamp on the piston of the caliper. Tighten the clamp slowly and evenly, as you may have to move it from side to side of the piston to keep the piston even as it goes back into the caliper. Go back till it is flush with the caliper housing, then you can release the clamp, and the claiper will fit over the new pads. But now remember, you will have to pump the brake pedal several times when finished in order to close the piston back tight to the pads. This can be done with the car running or shut off. The pedal will feel soft and go right to the floor, but after you pump them several times, it will get hard again. Good Luck.
If you have disk brakes, and you cannot fit the new brake pads in the callipers? Loosen the brake fluid reservoir cap to allow pressure to escape. Use a large C clamp connecting it to the front and back of the piston. 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.
More than likely you have not fully compressed the caliper piston into the caliper. Take the old inner brake pad and clip it on back onto the piston. With a large clamp (one side on the back of the caliper behind the piston and the other on the face of the old brake pad) and compress the piton slowly by tightening the clamp. It needs to bottom out completely. Remove the clamp and old brake pad and install the new pads. Make sure that when you install the caliper to the rotor that the brake pads stay locked in position and it will slide over the rotors and fit snug.
Make sure that the brake pedal has about 3/4" of free play before it actuates the master cylinder. Remove the front wheels and try to push the pads back into the caliper cylinders a little. This normally takes some effort. When pushed back, try to slide the caliper casting in and out as it normally floats to equalize the braking effort on both sides of the rotor. The pads depend on some lateral movement of the rotor turning to back off the pads as there are no springs to push them back. Make sure the pads are not worn to the extent that the little wear-warning tabs are touching the rotor. Hope this helps!
Use a caliper wind back tool which rotates the piston at the same time as pushing it back. Release the bleed screw to assist the wind back. If you use a brake hose clamp on the brake hose this will reduce the need to bleed the system.
Preliminaries Do 1 wheel at a time Use a jackstand on the wheel you are working on (safety First) Remove the tire on the selected wheel The Brake caliper is usually held on by 2 bolts. Some of the bolts are Allen wrench type, usually about ¼ inch or 5/16 inch. Remove and the complete brake caliper can be lifted off the rotor. The pads can now be removed. Before installing the new pads you must first return the pad piston to their original position in the caliper. Open the hood of the engine compartment and remove the cover on the master cylinder. This allow the brake fluid to be returned to the master cylinder. To return the pad piston to the original position you will need a C clamp and a flat piece of metal like a small flat file. Put the flat piece of metal on the piston and use the C clamp to put pressure on the piston. Tighten the C clamp slowly and you will see the piston slowly retract into the caliper body. Now you can insert the new pads into the caliper. Mount the caliper over the rotor and reinstall the 2 bolts.
Loringh Hope this helps Good Luck PS Please leave a rating if Appropriate Thanks