Having trouble changing front brakes need some help

If it has good pedal and just won't stop you probably are not getting any help from your power booster. Check for the vaccum hookup at the motor and on the front of the power booster behind the master cyclinder.

Put one of the old brake pads in front of the piston and use a c clamp to compress the piston.

sounds like it is time to replace the brake pads. i would do it quickly before you ruin the rotors.

Have you checked the brake fluid level?

You still have a restriction somewhere on that side if it is the only one that locks up.

When I change my front brakes, I use a "C" clamp to slowly push the piston back in. (You can get them for a few dollars at Wal-Mart, etc.) Make sure you open the brake fluid reservoir while compressing them, as the fluid level will rise; but don't leave the reservoir open too long, as brake fluid will absorb water from the air.
For the parking brake, I'm not sure. I think the parking brake often works off of the rear brakes, so changing the pads should have helped there. Maybe air in the lines? Do you have any trouble with "soft" or "mushy" brakes when you use them? If so, you might want to bleed the system, to get any air out - it can be dangerous.

get haynes repair manual.dont cost much .it got pictures .and it show you step by step .to change front disc brakes.

Sounds like you have pushed the brake peddle to the floor after you changed the pads. This can cause major probs in the master cylinder. The brake warning light should come on if this is the trouble. Frankster016

I have a e500 03 i have change the front pads and sensors and rear senor. the dash still says BRAKES VISIT SERVICE CENTER. BACK BRAKES ARE FINE. HELP.

Did you have this problem before you replaced the M/C? Inspect your brake system for leaks, especially the rubber hoses. Make sure all fittings are tight. Sometimes the caliper's seal around the piston will allow air to **** in, but won't leak fluid. Many cars from the 80's onward had pistons made out of plastic which causes a sticking and leaking problem. Many times rebuilt, loaded with pads, calipers cost just a little more than what a reseal kit costs. They have to be cutting corners somewhere.

If your vehicle has ABS, sometimes you have to hook a scanner up to bleed the brakes correctly. If you don't have ABS, you probably have a proportioning valve and these can cause trouble, especially on a high mileage vehicle.