[nu2-72]

pic 5 is the seal and washer off of the post. Again the seal rides inside the small bore. The post just slips in and out and there is no alignment to worry about. The entire assembly will rotate as needed when put together so the brakes will remain functional. As the pads wear, the hydraulic pressure pushes the piston out and rotates it, this way the post never has to move and the brakes are applied with the foot brake pedal as normal. When you set the park brake, the post rotates mechanically and sets the brakes.
pic 6 more of stem and seals. The washer goes back on first and the seal last. Do not put the seal on and try to force the washer over it. It will tear.
pic7 is the bore outer seal for the piston groove and the inner seal/o-ring
pic 8 is the o-ring better view with outer seal removed