Strange brake problem

[jmargush]

I installed a new 19mm master cylinder about 4weeks ago. I have been runnig the car around the neighborhood since not everything is ready for the road yet. I let it sit about a week without driving and now the pedal goes all the way to the floor.
Pedal was not as high and firm as I would like it before but there was at least some confidence there. was still able to heel toe now it goes down too far.

If I pump it I can gain some height and pressure. Any ideas?

Rebleed? should be ready to go on the road next week if I can get this worked out.

[914GT]

Yeah, I'd say you still have some air trapped in the master cylinder. Hopefully that's all it is.

[Dave at Pelican Parts]

Bleed, bleed, bleed, bleed. If this happens again, you've likely got a leak somewhere.

--DD