That crossed my mind. I checked the '49-'53 shop manual but there is no mention ither way... I did however just notice that the brake pedal was quite stiff. I cracked a bleeder and it had a little pressure on it. Re-bled it all out and it's back to normal.. Old fluid possibly? or was that DOT-3 synthetic a bad idea? The DOT-3 syn was a fresh bottle I had on the shelf when I redid the front brakes. Said compatible with all DOT-3 and DOT-4 systems, so I figured it was ok.. I'v pumped a crap load of fluid thru it now. master has been filled 3 or 4 times out of that DOT-3 syn bottle