I have a 91 accord I changed my master cylinder, my pedal still goes to the floor when the car is on, when it is off I get resistance, I am going to try and bleed the brakes more. I am very new to cars but I have changed pads and a rotor before, the rotor I have on now is bad I'm going to change it when I can but right now I am just wanting to know what could be causing this issue.

 

Did you bench bleed the M/C before install? If not take it off and start over.

 

Yeah we did that, it came with the tubes to do it.

 

Really? And you've bled the brakes at all 4 corners? Did you bleed them in the right order?

 

We just bled them from the master cylinder when we installed the new one, I watched a couple videos on how to do it. There were only 2 places to bleed them that I saw and they were on the m/c

 

Nope. You bled the master cylinder properly. Now you need to bleed the rest of the braking system. When you unhooked the lines from the MC some fluid likely dripped out leaving an air void in the line.

 

Okay so we have bled the first two and then turned the car on from the m/c we pumped the brake and bled them that way no were about to bleed them from the 3 and 4 from the diagram you sent

 

Okay we have bled the brakes but my dad said we could do it in a different order the back two first then the front two working from back passenger to driver. The brake still goes to the floor

 

Hondas are cross linked braking systems. The front left and rear right brakes are one system, and opposite for the others. You have to bleed them in a certain order or else you won't get the air out properly.

 

I would start considering a booster problem.

Why did you replace the master cylinder?