You need to bleed the brake system. To bleed the hydraulic brakes; you fill the reservoir, with brake fluid then,go to the farthest.cylinder,find the bleed plug(near the wheel cylinder, looks like a grease fitting) slip a hose tightly over the fitting, submerge the other end in a container of brake fluid,then loosen the fitting; (with a helper., slowly pressing the brake peddle down);fluid will come out to the container,if air bubbles,close the fitting at the end of flow then let up on brake peddle,do this till all air bubbles are gone, then go to next wheel cylinder repeat till all cylinder are bled(be sure all bleed fittings are re-tightened,when done. Good luck and keep me posted, be glad to answer any questions you may have.
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
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