I'll add this here too.
Here is a of brake part numbers for 1939-1948 Ford cars that can be found at your local auto parts store. No more blank stares when you ask for these parts. Just give the guy/gal/pimpled face kid, behind the counter the part number!
1939-1948 Left rear wheel cylinder CarQuest/EIS # EW156002
1939-1948 Right rear wheel cylinder CarQuest/EIS # EW156003
1942-1948 Left front wheel cylinder CarQuest/EIS # EW156000
1942-1948 Right front wheel cylinder CarQuest/EIS # EW156001
1939-1941 Front wheel cylinder repair kit CarQuest/EIS # C552
1942-1948 Front wheel cylinder repair kit CarQuest/EIS # C568
1939-1948 Rear wheel cylinder repair kit CarQuest/EIS # C554
1939-1948 Front brake hose CarQuest/EIS # SP296
1939-1948 New brake master cylinder CarQuest/EIS # E1050
1939-1948 Brake master cylinder repair kit CarQuest/EIS # M16
1939-1942 Front and rear brake shoes Raybestos # 38PG(premium quality) or 38RP(Standard quality)
1946-1948 Front and rear brake shoes Raybestos # 37PG(premium quality) or 37RP(standard quality)