how do i bleed the brakes

front you can press in-dont have to bleed the brakes. rear calipers need a special tool that twists(or screws) the piston back in. either way i dont see you needing a brake bleed, probably a new caliper.

You probably broke a seal in the caliper. Don't bleed them until you get the caliper fixed. Fluid around the piston is never a good thing. Once you get the caliper replaced you can then bleed the brakes. Make sure you have someone to help you as this makes the job a whole lot easier. You can buy a 1 man bleeder kit from an any auto parts store for less than $20 if you wish, but I always found the 2 man method to work best.

#1: Make sure you have plenty of Brake fluid on hand.
#2: Do 1 wheel at a time starting at the wheel furthest from the master cylinder. In this case, RR wheel first,than LR, than RF and finally, LF.
#3: Remove Master Cylinder cap and place it loosly on top of Master.
#4: Jack up 1 wheel and find the bleeder screw. Have your friend slowly and I mean SLOWLY pump the brake pedal about 3-4 times. Have him hold the pedal to the floor and crack open the bleeder screw just enough to hear air. PLEASE BE CAREFUL NOT TO GET THE FLUID ON YOUR CAR! it will eat the paint. Close the screw after about 2-3 seconds and have him pump the pedal 3-4 more times. Do this again on the first wheel. Once you are done with that one, check to make sure your fluid is still full in the Master Cylinder. Always check it because if it becomes empty, all you are doing is pumping air through your brake system.
Now, just repeat the above proceedure for each wheel and you are done.

Key points to remember.
Have your friend pump the pedal slowly you don't want him blowing Brake fluid all over the inside of your engine compartment.
Keep the M/C full of fluid
Only open the bleeder screw enough to let out the air

He will need a brake bleed after puts the new caliper on. If he can figure out how to do that himself. It's actually pretty easy.

Master cylinder is the metal bit under the brake fluid reservoir, usually attached to the power brake booster (round metal thing hanging off the firewall).

while you are at the auto part store buy a haynes/chilton you will use it a thousand times, it will tell you where the master cylinder is. Sounds like a bad caliper b/c when i changed my brake pads nothing was leaking, if you replace the caliper(or remove it at all) you will have to bleed them, the chilton manual will tell you how to do this