I just replaced my master cylinder and rear wheel cylinders bled the brakes and there is no leak that I can see not sure what to check next and my brake pedal still goes to the floor. My car is a 1990 civic sedan

 

Did you bench bleed the master cylinder?

 

Yes I did

 

Did you measure and compare the piston depth inside the bore of then new master cylinder and compare it to the original and adjust the push rod on the pedal assembly leaving .02 gap between its contact point?
That or you could still have air in the lines. If you get the speed bleeders and use the hose connected to the nipple going into a jar, it makes bleeding a breeze.

 

No I didn't do that

 

I would re-bleed and if it's the same, adjust the rod until your pedal feels normal.

 

Also check your brake shoe contact. Pull on the ebrake and if it comes up all the way you just need to remove the rubber grommet on the back of the guard of the drum at the top and inside is the adjuster you flick up and click while rotating the drum until the brakes just start making contact with the ebrake off
Make sure to bleed each line in the correct order aswell..

 

Ok thanks