The red oring goes under the upper bearing (part at the bottom, remember you are technically working on the pump upside down). This piece goes under the magnetic rotor, they should be sepperate and freely spinning on each other. The brakes are the 2 black pieces with serrations that protrude from the base of the shaft and mate the drive shaft to the magnetic rotor, if removed the rotor can spin without engaging the shaft and the shaft removed.