Brake pedal goes almost to the floor before brakes engage

[Jim S]

I have completed the Turner Brake upgrade and all new drum brake parts on the rear.  Today I got my original booster rebuilt back from Studebaker Itnl and a new master cylinder installed. I bleed the system 3 times.  The brakes engage, however only until the pedal is almost at the floor!  I checked the measurement of the booster to master push rod and it is correct. Any thoughts welcome.

Edited 15 hours ago by Jim S

[Zedman]

Jim, what year is your Avanti?.... Does it have a proportioning/Combination Valve?   If it does, did you bleed your brakes using the centering tool made for this purpose?  If you don't use this tool to fix the position of the internal shuttle valve, half your system will be left unbled.

[Jim S]

It is a 72.  The brand X booster and master cylinder that was in there had a proportioning valve in line.  I used the same valve with the OEM booster and master cyl that I put back in. I bled the system first without the valve as I was told the car originally did not use one.  Second time around, I put the valve back in and re bled.  It made no difference. The front calipers are grabbing, but with the rear wheels off the ground, I put it in gear and applied the brakes.  The rear wheels kept moving. Also, I don't know about the centering tool for the valve, so of course I did not do that!

Edited 29 minutes ago by Jim S