BillH wrote:
Bleeding the brakes can't hurt but, a little air in the system will not cause the pedal to go almost to the floor. It's the m/c.
If you hit the pedal with the engine off, it should be rock hard. If there's a bit of air in a line, it will feel a little spongy.
The only way that a pedal can go almost to the floor is if the fluid is bypassing the seals in the m/c or if there is an external leak.