Hi Keith,
I am not familiar with this booster, but did wonder if you noticed the pedal being tight when you initially pushed it down? If not then it could be a vacuum valve is not releasing, I have had that happen on other boosters/servos and that will hold the pedal down until the vacuum has dissapated.
Just a thought 
__________________
Richard
1943 Bedford QLD lorry - 1941 BSA WM20 m/cycle - 1943 Daimler Scout Car Mk2
Member of MVT, IMPS, MVG of NSW, KVE and AMVCS
KVE President & KVE News Editor
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