Rear Shock Absorber

Discharges air in air chamber (2) from air valve (1) when vehicle height of vehicle rear is higher than standard vehicle height, has shock absorber stroke in compressed direction, lowers vehicle height, and returns it to standard vehicle height.
Also charges air in air chamber from air valve when height of vehicle rear is lower than standard vehicle height, has shock absorber stroke in extending direction, raises vehicle height, and returns it to standard vehicle height.
Charged air, because of rubber (3) that is hard and located on side surface, does not expand in lateral direction, but expands in vertical direction, and enables shock absorber to extend or retract.

Without Hydraulic Body-Motion Control System

Fig 1: Sectional View Of Rear Shock Absorber (Without Hydraulic Body-Motion Control System)

Courtesy of NISSAN NORTH AMERICA, INC.

With Hydraulic Body-Motion Control System

Fig 2: Sectional View Of Rear Shock Absorber (With Hydraulic Body-Motion Control System)

Courtesy of NISSAN NORTH AMERICA, INC.