Lathe Brake Assemblies:
30-0137A LT Brake Assembly, $695.00. The lathe spindle brake assembly is a heavy chunk of steel that can be costly to ship. In most cases the housing and solenoid are not the issue. The typical faults are with worn pads, 57-0045 $35.00 ea  or a broken finger, 20-0199A $75.00 . The only reason to replace the complete assembly would be if the piston bore was damaged and it was leaking oil . If leaking, the bore should be inspected for damage to see if the assembly needs to be replaced or if the problem is just an O-Ring.