I'm searching for a brake cylinder, 51 Chevy 1 1/2 ton, 4100 series, rear wheel, the 'forward' or slave cylinder (each wheel has two cylinders, the aft cylinder accepts the main brake line coming in from the chassis and has a 3/16 line going out to the slave, and what I call the 'slave' sits on the forward side of the wheel and takes a 3/16 line from the aft cylinder inside the wheel.
See Figure 40, right side of page at:
http://chevy.tocmp.com/1948_51truckshop/51ctsm0521.htm Someone rebuilt these brakes and used 1/2 ton parts, plus one of mine has a deep grove.
See Figure 51, bottom of page, at:
http://chevy.tocmp.com/1948_51truckshop/51ctsm0525.htm Photo at:
http://www.ankisolutions.com/1951Chevy-AsPurchased.html Truck as purchased[/URL]