Brake Pedal to Floor

If you disassembled the master cylinder to clean it you may have inadvertently installed the piston backwards. I’ve seen the piston installed backwards on brand new and re-manufactured MC’s. 

That is a good thought. I did just take a look at one of the Masters, and unfortunately it is assembled correctly per illustrations, I was disappointed that it was.

Do you have access to a pressure bleeder?

I have this:

https://www.ebay.com/itm/REVER...4:g:fyIAAOSwvjdZXlOs

Seems to work okay as far as pushing fluid. 

Hi, just wondering if you solved your problem and what the cause of it was. I am experiencing something similar after having my front calipers rebuilt and fitting new brake hoses on the front, but not changing anything else - brakes were working fine before this change (except braking unevenly after pushing the pistons back to fit new brake pads - hence the caliper rebuild). I will need to intensify my bleeding procedure and see if it helps, but would like to know how you solved your problem.

cheers, Tim.

You cannot use a suction or reverse bleeder with speed bleeders. The speed bleeder has a built in check valve that only lets flow out of the caliper thus reverse bleeder does not work. The check ball has a spring that requires more force than vacuum to open it so vacuum does not work. You need to replace the shuttle as Marlin noted and then pump up the pedal until you get some resistance and then open a bleeder. You will need to do this numerous times to get the air out.

I feel your pain but the first thing that I would do is mount the master in the car and bleed it back to itself.

Regardless of the brand, I've had issues with brand new masters that when bled in the car back to themselves, solved the problem.

Why? Don't ask me to explain the inexplicable. In my experiences, what things are supposed to do out of the box, don't always.

If you get no pressure out of the master's ports then, it is what it is, the master is defective.

My problem is solved and I have a good brake pedal now. I think there was an excess of assembly grease after the caliper rebuild which was restricting proper flow out of the bleeders, and also a bit of other 'crud' in one of them. So after removing them while using the pressure bleeder to 'blow' out the excess grease with brake fluid and giving them a quick clean, then screwing them back in, followed by rigorous bleeding, all is good. And the brake fluid now gushes out when I crack a bleeder open with the pressure on, rather than dribbling as before.

Cheers, Tim.