The breather was in the cover on the model 41 and early Salisbury stuff. Later when the 44 appeared, the 44 has the breather as a hollow bolt holding...
I'd take a good look at the pedal assembly/linkage. I've been dealing with that on my jeep, it all wears and gets sloppy, which can lead to improper...
It sounds like to me that you have two issues going on. If your pedal travel is drifting to the left during the travel, then I would first check the...