If there is air in the system, it will pressurize when you pump on the brakes.

If your brake pedal is hitting the floor board and you cannot get pressure on the brake pedal by pumping the pedal 3-4 times, then you may have the wrong Master Cylinder bore. A smaller bore will increase the travel of the pedal. It's possible that the residule valve was holding pressure in the rear lines and you got pressure with a smaller stroke of the pedal.

Let us know if you can get pressure on the pedal by pumping it 3-4 times.

Tim

 

when I pump the brakes with the car off or with it turned on?

 

Unless they are power discs, it won't matter if the car is running or not.

Also, not that this is your problem but was there a proportioning valve installed when the disc conversion was done?

 

No the same master cylinder was used and proportioning valves from the drum setup

 

I agree with what has been said.

If you have front disc and rear drum you need a proportioning valve.

I would also find a better shop.

 

If they are power brakes, try to pump up the pressure with the car on. If they are manual, it doesn't matter; it will give the same results on or off.

Tim