Soft pedal after conversion.

vallianted said

Hey all.did a front disc brake conversion on my 65 Valliant over the winter.and I can't seem to get rid of the soft pedal.I was told that I didn't need the hold off valve and I'm wondering if I should have used it?I bench bled the master tried blocking off each side to isolate the problem and found that it's in the front.anyone have any advise on how to solve this problem?
Ted

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Need a little more information on your conversion.
SBP Kelsey-Hayes discs, '73 and up LBP discs, or some form of aftermarket system?
What master cylinder was used (year, bore, original app., or aftermarket), or did you stay with the '65 single-pot master?
Sounds to me like you may not have enough master cylinder volume- did you change to a master designed for disc brakes (larger reservoir for front brakes, generally the rear reservoir)? Even the old single reservoir masters used a riser on the reservoir (fits between the master and the lid) to increase the volume when equipped with disc brakes. In this instance the residual valve and proportioning valve were fitted to the rear brake line where it exits the distribution block.