this happened to me when i was trying to find a leak on my 38, i took off the drums and pressed the brakes and sure enough the drivers front came off. dont test it like this. i then put it back together, bled it, and tested it with the drums on BUT they needed adjustment so i adjusted to have a drag

1937 Chevrolet Carryall http://www.oldmemoriescc.com/images/blvdbombs/images/IMG_6465_JPG.jpg
1937 1/2 ton (sold)
1938 1/2 ton (sold)
1939 1/2 ton (sold)
Phil 4:4