1952 Ford F6 brake question

[GasWorksGarage]

hello all,

I recently replaced the entire brake system new lines wheels cylinders master cylinder shoes turned drums. I can get a peddle. I can pump it up and it will hold until I release and then right back to the floor. This is the 3rd master cylinder thinking I must have got 2 bad in a row ( doubtful ).
I have bleed over 2 gallons of fluid through it. If I bench bleed the master cylinder it holds until I mount it.

Has to be something I am missing.

Please help!!!

thanks in advance

 

[big job]

The F6 should have a brake booster and thats where the residual check valve is. If you
have no booster then the check valve is in the master cylinder. I still think there is a air
bubble in there somewhere. Sometimes this will work disconnect batt so stop lights
don't come on pump it up put a stick on pedal to the seat and leave it over night. If it
does have a booster that's the first you bleed . Could also be a bad booster piston thats
blowing by its seals. I too have a F6 same symptoms bad booster= Napa About $180 for
a new Bendix may have to redrill holes in the bracket. sam

 

[ponymare]

Just throwing this in, but did you adjust the shoes out against the drums.

 

[GasWorksGarage]

hello,

yes the shoes where adjusted out till a slight drag. no bosster

 

[rich b]

Sometimes it helps to adjust the brakes out as tight as you can, bleed the brakes, and then back off the adjustment.