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groan......master cylinder not brakes and rotors and what not. hopefully you kept all of you old stuff because there was probably nothing wrong with it. also, make sure that you do a realy good job bleading you break = air will cause the pedal to go down to the floor.
also if you change the master cylinder, that you try and bleed most of the air out before you install it into your vehicle
I just went to Brake Masters this morning and had them replace the Master Cylinder since I was experiencing the pedal very spongy and going to the floor. When they replaced the Master Cylinder and they gave me back the car, the brakes were still spongy and going to the floor. I addressed this to them and they took another look at it, but when I took it for a second time, the brakes were extremely spongy. It was almost like they gave me back my car in worst condition to when I brought it in. Can you help?
There is a bleeder valve on the top of the caliper. Have another person pump the brake (WHILE THE CAR IS OFF) until the brake is solid with pressure. Now have them continue to apply pressure by slowly turning the bleeder valve counter clockwise until you hear air or see fluid being expelled. Once the brake pedal pumper has pushed the peddle to the floor have him keep pressure on the peddle until you re-tighten the bleeder valve. DO NOT HAVE HIM RELEASE PRESSURE WHILE THE VALVE IS OPEN or air can make its way to the master cylinder. Start with the tire furthest away from the master cylinder and work towards it. I know you are thinking, "but only one caliper has air in it". This does not matter once air is induced into the brake system. Each and every caliper must be bled to maintain safety and failure to do so can cost your your life along with someone elses.