I have no presure in my brake pedal,how do i fix this?

I changed my front brakes on my 2005 chrysler pacifica. There is no presure in the brake pedal and the brakes don'twork until you have the pedal all the way to the floor.I can't find a bleeder valve and my friend tells me if i open the hose leading to the caliper I will mess up the computer. What do I do to fix my pedal so the brakes work?I have no presure in my brake pedal,how do i fix this?You have air in your front calipers and you master clyinder may also be bad look on the Calipers finf the Brake hose connection at the Calipers and look near the top of the caliper body. Fill the Master full have some one pump the brake pedal and hold it while you open the bleeder screw when when you get a stream of clear fluid that one is done repeat the process on the other side . If you still do not have a firm pedal, you need to bleed you master also.I have no presure in my brake pedal,how do i fix this?Look at your owners manual and find the bleeder valve, it isn't that hard. Then, following their directions, you will bleed the brake-lines, something you SHOULD have done as part of your original brake-job. Follow all safety instructions. If you can't manage this, and you have no brakes, get your car towed to a repairman.I have no presure in my brake pedal,how do i fix this?%26quot;Setting the Brake Pads after installation%26quot;; Make sure the fluid Reservoir is full, Pump Brake Peddle 8 to15 times Slowly to set the Brake Pads Before test driving!!I have no presure in my brake pedal,how do i fix this?Something no one else has mentioned... what about the master cylinder? It could be bad, or could have air in it. Rare, but not unheard of.I have no presure in my brake pedal,how do i fix this?well how did you push the piston from the caliper back in? then you have to pump the pedal to see if it builds pressure if after 3 or 4 pumps no pressure. Bleed the brakes and make sure the resvoir has brake fluid in it... Computer? i dont think so.... but ive never worked on a pacifica but highly doubt it would mess it up. if you dont know how to bleed find someone to show you otherwise it will get worse.... if it still does not build pressure you need to make sure everything is the way it is suppose to be.I have no presure in my brake pedal,how do i fix this?hmm. All calipers should have a bleeder valve. What exactly did you change? Pads and rotors shouldn't affect pedal feel. If you opened up the system by removing a brake hose or caliper then you have to bleed the entire system. If you have a spongy pedal then most likely you have air in the system. Borrow a power bleeder oR get some help and bleed the system. Start with the wheel furthest from the master cylinder. Have someone press on the brake pedal (Engine off) and hold it about 3/4 from the bottom. Open bleeder slightly and reseal. Repeat process until some firmness comes back to the pedal. Do this on each wheel. Watch the fluid level make sure it doesn't get too lowI have no presure in my brake pedal,how do i fix this?When you put new pads on you should have more than enough brake fluid in the master cylinder in fact some times you have to take some out before it runs over with new brakes. Check the master cylinder and see if it's low if so you may have broken one of the brake lines or hoses when the calipers were hanging there. There should also be bleeders on the calipers some where to bleed air from the system. If you didn't open any brake lines your brakes should have worked when you put the brakes on.I have no presure in my brake pedal,how do i fix this?you must have a bleeder some where on the caliper. and i dont think you will mess up the computer . check again for the bleeder valve . never heard of messing up the computer