I replaced the front rotors, pads, driver's side axle, and replaced the brake fluid by bleeding at all 4 points.

Now to my surprise, the pedal travels to the floor (!). After doing some reading online, I decided to replace the master cylinder.

Now, after a new master cylinder, the pedal STILL travels to the floor. What is going on here?!

(firm then spongy with car off, travels to the floor with car running).

Please help!!

 

you have a bubble somewhere still. i had the same problem before i also changed the master cylinder still had bad pedal.. i found my air bubble in the rear.. i had to bleed like a half a quart to finally get it out.

 

You were right campfire - to eliminate the possibility, I went around again and bled all the brakes - all is fine now.