I would guess that the lock has been worn. It needs a fairly sharp edge where the pedal shaft goes thru it to grab the shaft. Could also be that the spring is weak as well. You might be able to remove the locking bar and use a file to "sharpen" the hole. Otherwise, you probably need to replace the locking bar.


Kevin
1951 Chevy 3100 work truck
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1929 Ford pickup restored from the ground up. | 1929 Ford Special Coupe (First car)
Busting rust since the mid-60's
If you're smart enough to take it apart, you darn well better be smart enough to put it back together.