Hi All, I'm looking for some brake help please.

I have a '66 coupe with the standard drums in the back, a scarebird bracket set up in the front, and the mustang steve pedal.  I put on a power booster and new master cylinder last year.  It is a disc/drum m/c and I have a prop valve to the rear brakes.

Now things are working but I'm not able to lock up the tires which I think I should be able to do.  I can bottom out the brake pedal, meaning take it to the floor, and although there is pressure, its not enough to lock up the tires.  I can drive the car but can not do an emergency stop.  The car brakes feel normal unless I need a 'quick stop'.

Now I did new cheap pads in the front last year which was suggested.  This did help.  I found a leaky wheel cylinder in the right rear.  I corrected this and now I have all new hardware, shoes, and wheel cylinders in the rear.  I have adjusted the rear brakes correctly.  Then I have bleed the brakes twice.  Still not the solid stop that I am expecting. 

Now I also wanted to say that I had a manual maverick m/c (disc/drum) set up on there prior to the power booster and I could lock up the brakes.  Another thing that is probably not normal is that I put a 'in line' brake light switch.  I did this because I was having troubles with my brake lights coming on when I touched the brakes like I wanted them to.  This seemed like a easy fix.

I don't remember the year/car that the m/c is from but I do recall asking which one I needed when I did the swap so I'm confident that it should work and it is new.  I will check and I will take pictures of everything if this might help provide additional information.

I can also say that the push rod is adjusted correctly.  I've checked this a couple times last year and adjusted it, performace is the same. 

My gut tells me that things are still not bled right.  I plan on doing another bleed this coming weekend.  I'm going to really go through a lot of fluid to be sure I've got a solid bleed going at all 4 corners.  Someone mentioned that my switch may have air because of how I plumbed it in there so I'm going to 'bleed' it some what with rags under it and losening the connection flare and tightening it.  Not sure that will help or hurt.   I'm stretching now I know.  There are NO leaks any where. All fluid is new.  Booster is working great.  Mustang Steve Pedal is great.  Lights work great.  I can floor the brakes and feel the pedal bottom out but the tires don't lock up. 

Any suggestions are greatly appreciated.  I'm not even excited to drive the car this year because of the poor feel.  I even considered buying a whole new brake kit with all new (booster, m/c, etc) but I've dumped more than enough $$$ into this already.

Thanks guys.
Richard